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Digestion

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1183:. The mouth is surrounded by strong lips, which act like a hand to grab pieces of dead grass, leaves, and weeds, with bits of soil to help chew. The lips break the food down into smaller pieces. In the pharynx, the food is lubricated by mucus secretions for easier passage. The esophagus adds calcium carbonate to neutralize the acids formed by food matter decay. Temporary storage occurs in the crop where food and calcium carbonate are mixed. The powerful muscles of the gizzard churn and mix the mass of food and dirt. When the churning is complete, the glands in the walls of the gizzard add enzymes to the thick paste, which helps chemically breakdown the organic matter. By 733: 1308: 684: 680:. Portions of the outer membrane pinch off, forming spherical structures made of a lipid bilayer enclosing periplasmic materials. Vesicles from a number of bacterial species have been found to contain virulence factors, some have immunomodulatory effects, and some can directly adhere to and intoxicate host cells. While release of vesicles has been demonstrated as a general response to stress conditions, the process of loading cargo proteins seems to be selective. 1101: 819: 1568: 1251:. Each step in digestion requires energy, and thus imposes an "overhead charge" on the energy made available from absorbed substances. Differences in that overhead cost are important influences on lifestyle, behavior, and even physical structures. Examples may be seen in humans, who differ considerably from other hominids (lack of hair, smaller jaws and musculature, different dentition, length of intestines, cooking, etc.). 835: 1862: 38: 1009: 489: 374:
Hydrochloric acid provides acidic pH for pepsin. At the same time protein digestion is occurring, mechanical mixing occurs by peristalsis, which is waves of muscular contractions that move along the stomach wall. This allows the mass of food to further mix with the digestive enzymes. Pepsin breaks down proteins into
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and nerve supply which enables proprioception. This is the ability of sensation when chewing, for example if we were to bite into something too hard for our teeth, such as a chipped plate mixed in food, our teeth send a message to our brain and we realise that it cannot be chewed, so we stop trying.
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The abomasum is the fourth and final stomach compartment in ruminants. It is a close equivalent of a monogastric stomach (e.g., those in humans or pigs), and digesta is processed here in much the same way. It serves primarily as a site for acid hydrolysis of microbial and dietary protein, preparing
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Teeth (singular tooth) are small whitish structures found in the jaws (or mouths) of many vertebrates that are used to tear, scrape, milk and chew food. Teeth are not made of bone, but rather of tissues of varying density and hardness, such as enamel, dentine and cementum. Human teeth have a blood
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There are at least five hormones that aid and regulate the digestive system in mammals. There are variations across the vertebrates, as for instance in birds. Arrangements are complex and additional details are regularly discovered. Connections to metabolic control (largely the glucose-insulin
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that can make its own food through photosynthesis, it does not eat and digest its prey for the traditional objectives of harvesting energy and carbon, but mines prey primarily for essential nutrients (nitrogen and phosphorus in particular) that are in short supply in its boggy, acidic habitat.
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Young elephants, pandas, koalas, and hippos eat the faeces of their mother, probably to obtain the bacteria required to properly digest vegetation. When they are born, their intestines do not contain these bacteria (they are completely sterile). Without them, they would be unable to get any
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to digest milk proteins. As the first two chemicals may damage the stomach wall, mucus and bicarbonates are secreted by the stomach. They provide a slimy layer that acts as a shield against the damaging effects of chemicals like concentrated hydrochloric acid while also aiding lubrication.
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these protein sources for further digestion and absorption in the small intestine. Digesta is finally moved into the small intestine, where the digestion and absorption of nutrients occurs. Microbes produced in the reticulo-rumen are also digested in the small intestine.
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Digestion is a complex process controlled by several factors. pH plays a crucial role in a normally functioning digestive tract. In the mouth, pharynx and esophagus, pH is typically about 6.8, very weakly acidic. Saliva controls pH in this region of the digestive tract.
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and then passes through the small intestine, in which digestion continues. When the chyme is fully digested, it is absorbed into the blood. 95% of nutrient absorption occurs in the small intestine. Water and minerals are reabsorbed back into the blood in the
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and bicarbonates are secreted for protection. In the stomach further release of enzymes break down the food further and this is combined with the churning action of the stomach. Mainly proteins are digested in stomach. The partially digested food enters the
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behaviours – eating specialised faeces in order to re-digest food, especially in the case of roughage. Capybara, rabbits, hamsters and other related species do not have a complex digestive system as do, for example, ruminants. Instead they extract more
879:. It is used to kill and tear prey into manageable pieces. The beak is very robust, but does not contain any minerals, unlike the teeth and jaws of many other organisms, including marine species. The beak is the only indigestible part of the squid. 1199:, digestion is a multistage process in the digestive system, starting from ingestion of raw materials, most often other organisms. Ingestion usually involves some type of mechanical and chemical processing. Digestion is separated into four steps: 1345:
is around 9 metres (30 feet) long. Food digestion physiology varies between individuals and upon other factors such as the characteristics of the food and size of the meal, and the process of digestion normally takes between 24 and 72 hours.
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Viola-Villegas N, Rabideau AE, Bartholomä M, Zubieta J, Doyle RP (August 2009). "Targeting the cubilin receptor through the vitamin B(12) uptake pathway: cytotoxicity and mechanistic insight through fluorescent Re(I) delivery".
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functions as a stomach in both digestion and the distribution of nutrients to all parts of the body. Extracellular digestion takes place within this central cavity, which is lined with the gastrodermis, the internal layer of
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primarily eat seeds, nuts, and fruit, using their beaks to open even the toughest seed. First they scratch a thin line with the sharp point of the beak, then they shear the seed open with the sides of the beak.
1748:. Lactose intolerance varies widely by genetic heritage; more than 90 percent of peoples of east Asian descent are lactose intolerant, in contrast to about 5 percent of people of northern European descent. 1484:
and release of acetylcholine. Gastric secretion at this phase rises to 40% of maximum rate. Acidity in the stomach is not buffered by food at this point and thus acts to inhibit parietal (secretes acid) and
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In a channel transport system, several proteins form a contiguous channel traversing the inner and outer membranes of the bacteria. It is a simple system, which consists of only three protein subunits: the
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In the small intestines, the duodenum provides critical pH balancing to activate digestive enzymes. The liver secretes bile into the duodenum to neutralize the acidic conditions from the stomach, and the
1054:, and abomasum. In the first two chambers, the rumen and the reticulum, the food is mixed with saliva and separates into layers of solid and liquid material. Solids clump together to form the cud (or 966:
The shapes, sizes and numbers of types of animals' teeth are related to their diets. For example, herbivores have a number of molars which are used to grind plant matter, which is difficult to digest.
1187:, the mixture is sent to the intestine where friendly bacteria continue chemical breakdown. This releases carbohydrates, protein, fat, and various vitamins and minerals for absorption into the body. 477:, secrete biotoxins and digestive chemicals (e.g., enzymes) into the extracellular environment prior to ingestion of the consequent "soup". In others, once potential nutrients or food is inside the 629:
Ti or Ri plasmids contain elements that can transfer to plant cells. Transferred genes enter the plant cell nucleus and effectively transform the plant cells into factories for the production of
470:) in which internal digestion occurs, which is more efficient because more of the broken down products can be captured, and the internal chemical environment can be more efficiently controlled. 1127:
have the ability to turn their stomachs inside out and evert it out of their mouths in order to get rid of unwanted contents (perhaps developed as a way to reduce exposure to toxins).
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by enzymes in the small intestine. Studies suggest that increasing the number of chews per bite increases relevant gut hormones and may decrease self-reported hunger and food intake.
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Digestive systems take many forms. There is a fundamental distinction between internal and external digestion. External digestion developed earlier in evolutionary history, and most
551:. This secretion system transports various chemical species, from ions, drugs, to proteins of various sizes (20–900 kDa). The chemical species secreted vary in size from the small 3047: 426:
MK7) produced by bacteria in the colon are also absorbed into the blood in the colon. Absorption of water, simple sugar and alcohol also takes place in stomach. Waste material (
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is very thin, and underlain by a plexus of veins. This is an ideal location for introducing certain medications to the body. The sublingual route takes advantage of the highly
1740:. Glucose and galactose can be absorbed by the small intestine. Approximately 65 percent of the adult population produce only small amounts of lactase and are unable to eat 2009: 587:
and showed that toxins could be injected directly from the bacterial cytoplasm into the cytoplasm of its host's cells rather than be secreted into the extracellular medium.
270:, food enters the mouth and mechanical digestion of the food starts by the action of mastication (chewing), a form of mechanical digestion, and the wetting contact of 921:. The tongue also has a touch sense for locating and positioning food particles that require further chewing. The tongue is used to roll food particles into a 2004: 1151:. Soft faecal pellets of partially digested food are excreted and generally consumed immediately. They also produce normal droppings, which are not eaten. 1254:
The major part of digestion takes place in the small intestine. The large intestine primarily serves as a site for fermentation of indigestible matter by
1669:. However fats are mainly digested in the small intestine. The presence of fat in the small intestine produces hormones that stimulate the release of 3040: 948:
quality of the oral cavity, and allows for the speedy application of medication into the cardiovascular system, bypassing the gastrointestinal tract.
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to neutralize the acidic chyme, thus creating a neutral environment. The mucosal tissue of the small intestines is alkaline with a pH of about 8.5.
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in the oral cavity (mouth). After undergoing mastication and starch digestion, the food will be in the form of a small, round slurry mass called a
732: 2735: 2323: 2301: 2252: 603:, which uses this system to introduce the Ti plasmid and proteins into the host, which develops the crown gall (tumor). The VirB complex of 3033: 3003: 485:
or a sac-like structure, through a tube, or through several specialized organs aimed at making the absorption of nutrients more efficient.
2986: 1923:(GIP) – is in the duodenum and decreases the stomach churning in turn slowing the emptying in the stomach. Another function is to induce 1999: 2991: 1913:(CCK) – is in the duodenum and stimulates the release of digestive enzymes in the pancreas and stimulates the emptying of bile in the 1313: 1124: 1324: 2347: 2280: 2110: 2054: 121: 2239:
Maton, Anthea; Jean Hopkins; Charles William McLaughlin; Susan Johnson; Maryanna Quon Warner; David LaHart; Jill D. Wright (1993).
1285:. The stomach continues to break food down mechanically and chemically through churning and mixing with both acids and enzymes. 1829:-haptocorrin complexes pass from the stomach via the pylorus to the duodenum, pancreatic proteases cleave haptocorrin from the B 2019: 1328: 1326: 3317: 1994: 1320: 59: 1657:
Fatty acid metabolism § Dietary sources of fatty acids, their digestion, absorption, transport in the blood and storage
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machinery of some bacteria (and archaeal flagella) is capable of transporting both DNA and proteins. It was discovered in
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Both cells recircularize their plasmids, synthesize second strands, and reproduce pili; both cells are now viable donors.
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Beasley, DeAnna E.; Koltz, Amanda M.; Lambert, Johanna E.; Fierer, Noah; Dunn, Rob R. (July 2015). Li, Xiangzhen (ed.).
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The Ti and Ri plasmids are themselves conjugative. Ti and Ri transfer between bacteria uses an independent system (the
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that is often divided into two processes based on how food is broken down: mechanical and chemical digestion. The term
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Miserez, A; Li, Y; Waite, H; Zok, F (2007). "Jumbo squid beaks: Inspiration for design of robust organic composites".
2619:"Entamoeba histolytica Phagocytosis of Human Erythrocytes Involves PATMK, a Member of the Transmembrane Kinase Family" 1962: 540: 74: 1116:
has been mentioned above under abomasum and crop, referring to crop milk, a secretion from the lining of the crop of
1058:). The cud is then regurgitated, chewed slowly to completely mix it with saliva and to break down the particle size. 3483: 3216: 1920: 1548: 1312: 458:
into the environment surrounding the organism, where they break down an organic material, and some of the products
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refers to the physical breakdown of large pieces of food into smaller pieces which can subsequently be accessed by
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Miquel-Kergoat, Sophie; Azais-Braesco, Veronique; Burton-Freeman, Britt; Hetherington, Marion M. (2015-11-01).
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used for the storage of food prior to digestion. In some birds it is an expanded, muscular pouch near the
717:: waste and undigested matter is excreted through the mouth/anus, which can be described as an incomplete 677: 673: 548: 467: 267: 195: 1543:
The intestinal phase has two parts, the excitatory and the inhibitory. Partially digested food fills the
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Absorption: of nutrients from the digestive system to the circulatory and lymphatic capillaries through
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Boettner, D.R.; Huston, C.D.; Linford, A.S.; Buss, S.N.; Houpt, E.; Sherman, N.E.; Petri, W.A. (2008).
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Dusenbery, David B. (1996). "Life at Small Scale", pp. 113–115. Scientific American Library, New York.
2102: 1889:. Secretion of gastrin is stimulated by food arriving in stomach. The secretion is inhibited by low pH. 1221:
and enzymes in the stomach and intestine to break down complex chemical species into simple structures,
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molecules from stomach acid as they enter the stomach and are cleaved from their protein complexes.
3606: 3304: 1745: 1719:, resulting in progressively smaller chains of glucose. This results in simple sugars glucose and 1450: 1047: 459: 147: 143: 135: 2545:"Release of outer membrane vesicles by Gram-negative bacteria is a novel envelope stress response" 1512:, which stimulates the release of more gastric juices. As protein enters the stomach, it binds to 1323: 1316: 3494: 3089: 2670: 1501: 2593: 1954:. Most digestive enzymes are sensitive to pH and will denature in a high or low pH environment. 1758:, commonly known as table sugar, cane sugar, or beet sugar. Sucrose digestion yields the sugars 1321: 1100: 2960: 2901: 2865: 2836:"Holotranscobalamin, a marker of vitamin B-12 status: analytical aspects and clinical utility" 2774: 2731: 2687: 2650: 2574: 2525: 2484: 2439: 2390: 2343: 2319: 2297: 2276: 2258: 2248: 2218: 2210: 2169: 2161: 2106: 2050: 1886: 1807: 1784: 1670: 1529: 1477: 1407: 1374: 1354: 1325: 1210: 1055: 922: 818: 620: 508:
The mobile plasmid is nicked and a single strand of DNA is transferred to the recipient cell.
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means that a molecular syringe is used through which a bacterium (e.g. certain types of
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The cephalic phase occurs at the sight, thought and smell of food, which stimulate the
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Underlying the process is muscle movement throughout the system through swallowing and
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Egestion (Excretion): Removal of undigested materials from the digestive tract through
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of the bacteria, which are in turn endosymbionts (or parasites) of the infected plant.
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A flesh fly "blowing a bubble", possibly to concentrate its food by evaporating water
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In the large intestine, the passage of food is slower to enable fermentation by the
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compounds into small water-soluble components so that they can be absorbed into the
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of the intestine. Bile helps in emulsification of fats and also activates lipases.
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use several systems to obtain nutrients from other organisms in the environments.
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Mechanical and chemical breakdown: mastication and the mixing of the resulting
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component of gastrointestinal motility and stimulates the production of pepsin.
3504: 3429: 3228: 3149: 2142:"Gastroduodenal mucus bicarbonate barrier: protection against acid and pepsin" 1882: 1777: 1438: 1434: 1353:
with the secretion of saliva and its digestive enzymes. Food is formed into a
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Christie PJ; Atmakuri K; Jabubowski S; Krishnamoorthy V; Cascales E. (2005).
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To aid in the digestion of their food, animals evolved organs such as beaks,
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to tighten to prevent more food from entering, and inhibits local reflexes.
1537: 1426: 1362: 1233: 1203: 1180: 1172: 1164: 1144: 1062: 1027: 1002: 995: 967: 926: 777: 753: 660:, operon). Such transfer creates virulent strains from previously avirulent 657: 522: 455: 419: 334: 2964: 2905: 2869: 2778: 2691: 2654: 2578: 2529: 2443: 2394: 2222: 2173: 2120: 2064: 1677:
from the liver which helps in the emulsification of fats for absorption of
709:. This cavity has only one opening to the outside that functions as both a 2488: 2316:
Bacterial Secreted Proteins: Secretory Mechanisms and Role in Pathogenesis
223:. In certain organisms, these smaller substances are absorbed through the 3308: 3287: 3154: 1900: 1896: 1892: 1781: 1759: 1686: 1632: 1604: 1544: 1513: 1387: 1090: 1086: 1039: 1035: 945: 876: 615: 527: 478: 402: 398: 379: 375: 366: 317: 2520: 2503: 1008: 488: 17: 3199: 2376: 2014: 1929: 1924: 1874: 1842: 1841:-IF complexes travel to the ileum portion of the small intestine where 1755: 1751: 1733: 1726: 1720: 1716: 1708: 1644: 1608: 1552: 1521: 1274: 1225: 1176: 1168: 1135: 1131: 757: 474: 390: 362: 338: 248: 2897: 1950:
is contained in saliva and starts the breakdown of carbohydrates into
1277:. Mechanical and chemical digestion begin in the mouth where food is 1206:: placing food into the mouth (entry of food in the digestive system), 3334: 3292: 3204: 3175: 3094: 2504:"Bacterial outer membrane vesicles and the host-pathogen interaction" 2045:. Introduction by C. Everett Koop. New York: Chelsea House. pp.  1965:
proteins for further digestion in the small intestines, and provides
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ions, which raises the pH of the stomach. Inhibition of gastrin and
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to take place. Here, water is absorbed and waste material stored as
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bacteria and for resorption of water from digests before excretion.
201: 1723:(2 glucose molecules) that can be absorbed by the small intestine. 1042:). Ruminants have a fore-stomach with four chambers. These are the 672:
In addition to the use of the multiprotein complexes listed above,
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Pilus attaches to recipient cell, bringing the two cells together.
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region underneath the front of the tongue is a location where the
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possess another method for release of material: the formation of
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is equipped with a sharp horny beak mainly made of cross-linked
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microorganisms can be killed and digested. Phagosomes fuse with
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break down food into the small compounds that the body can use.
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and glucose which are readily absorbed by the small intestine.
1635:. For example, trypsin is secreted by pancreas in the form of 1306: 1562: 31: 1607:
in which 3 main enzymes, pepsin secreted by the stomach and
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of the stomach, presence of food in stomach and decrease in
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or throat. In adult doves and pigeons, the crop can produce
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The gastric phase takes 3 to 4 hours. It is stimulated by
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from grass by giving their food a second pass through the
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with which the parents feed their young by regurgitation.
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to improve the absorption of nutrients by increasing the
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secreted by the pancreas, break down food proteins into
1917:. This hormone is secreted in response to fat in chyme. 1899:
and signals the secretion of sodium bicarbonate in the
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from where it enters the stomach through the action of
917:. The underside of the tongue is covered with a smooth 1520:
secretion is lifted. This triggers G cells to release
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The stomach's high acidity inhibits the breakdown of
1907:. This hormone responds to the acidity of the chyme. 1528:
to secrete gastric acid. Gastric acid is about 0.5%
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in these chambers (the reticulo-rumen) by microbes: (
986:, or croup, is a thin-walled expanded portion of the 1661:
Digestion of some fats can begin in the mouth where
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Secretion § Secretion in Gram negative bacteria
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Discovery and development of proton pump inhibitors
382:, which is further broken down into dipeptides and 182: 170: 165: 160: 155: 62:. Unsourced material may be challenged and removed. 2296:, p. 280. Harvard University Press, Cambridge, MA 2240: 1799:Some nutrients are complex molecules (for example 2140:Allen, Adrian; Flemström, Gunnar (January 2005). 1961:within it. This acidity confers two benefits: it 1012:Rough illustration of a ruminant digestive system 913:(deglutition). It is sensitive and kept moist by 619:, conjugative elements naturally engage in inter- 2753:"Disintegration of solid foods in human stomach" 1711:units arranged in long chains called amylose, a 1681:. Complete digestion of one molecule of fat (a 1381:which would damage the walls of the stomach and 2146:American Journal of Physiology. Cell Physiology 1754:is an enzyme that breaks down the disaccharide 1310: 401:where it mixes with digestive enzymes from the 1155:nutritional value from many plant components. 764:. The vacuole is formed by the fusion of the 3041: 1744:milk-based foods. This is commonly known as 1269:in which saliva is produced in the mouth and 859:that are specialised according to the bird's 8: 2340:Bacterial Pathogenesis: A Molecular Approach 1903:and it stimulates the bile secretion in the 1885:(an inactive form of the enzyme pepsin) and 1707:In humans, dietary starches are composed of 1603:Protein digestion occurs in the stomach and 1337:Upper and lower human gastrointestinal tract 1293:, and the process finishes with defecation. 1265:, preparation for digestion begins with the 1001:Certain insects may have a crop or enlarged 492:Schematic drawing of bacterial conjugation. 2005:Evolution of the mammalian digestive system 1818:in saliva strongly binds and protects the B 3527: 3469: 3260: 3247: 3077: 3070: 3048: 3034: 3026: 2594:"How does the Venus flytrap digest flies?" 1472:. Taste and smell stimuli are sent to the 282:, an enzyme which starts the digestion of 243:. Mechanical digestion takes place in the 140:Precipitation (chemistry) § Digestion 2954: 2944: 2859: 2768: 2644: 2634: 2568: 2519: 2478: 2433: 2384: 2361:"The versatile Type IV secretion systems" 2204: 1665:breaks down some short chain lipids into 1445:Neural and biochemical control mechanisms 1167:'s digestive system consists of a mouth, 840:Squid beak with ruler for size comparison 122:Learn how and when to remove this message 2792: 2790: 2788: 2705:Gordon John Larkman Ramel (2008-09-29). 2338:Salyers, A.A. & Whitt, D.D. (2002). 1639:, which is activated in the duodenum by 1007: 298: 27:Biological process of breaking down food 2730:. Sumter, SC: Levi Publishing Co, Inc. 2247:. Englewood Cliffs, NJ: Prentice Hall. 2234: 2232: 2031: 1932:– is in the duodenum and increases the 1877:– is in the stomach and stimulates the 1643:to form trypsin. Trypsin then cleaves 1406:. The intestinal walls are lined with 897:is skeletal muscle on the floor of the 559:cell adhesion protein LapA of 900 kDa. 2834:Nexo E, Hoffmann-Lücke E (July 2011). 2426:10.1146/annurev.micro.58.030603.123630 2342:, 2nd ed., Washington, DC: ASM Press. 1865:Action of the major digestive hormones 1480:. After this it is routed through the 974:which are used to kill and tear meat. 901:of most vertebrates, that manipulates 810:, teeth, crops, gizzards, and others. 768:around the particle. A phagosome is a 286:in the food. The saliva also contains 199: 152: 1791:(DNase and RNase) from the pancreas. 1619:that are then broken down by various 780:in their maturation process, forming 760:formed around a particle absorbed by 473:Some organisms, including nearly all 7: 2797:Digestion of fats (triacylglycerols) 1736:to its component parts, glucose and 1433:to be removed by defecation via the 1069:, is primarily broken down into the 215:is the breakdown of large insoluble 60:adding citations to reliable sources 2997:How does the Digestive System Work? 2543:McBroom, A.J.; Kuehn, M.J. (2007). 2000:Digestive system of humpback whales 555:peptide colicin V, (10 kDa) to the 450:still rely on it. In this process, 274:. Saliva, a liquid secreted by the 251:and in the small intestine through 2815:. US National Institutes of Health 1981:empties into the duodenum, adding 1969:, damaging or eliminating various 1729:is an enzyme that breaks down the 925:before being transported down the 668:Release of outer membrane vesicles 641:. The Ti and Ri plasmids are thus 623:conjugation. Such elements as the 481:, digestion can be conducted to a 25: 2502:Kuehn, M.J.; Kesty, N.C. (2005). 2457:Chatterjee, S.N.; Das, J (1967). 1776:DNA and RNA are broken down into 798:Specialised organs and behaviours 290:, which lubricates the food; the 2770:10.1111/j.1750-3841.2008.00766.x 2561:10.1111/j.1365-2958.2006.05522.x 2359:Cascales E, Christie PJ (2003). 1566: 1489:(secretes gastrin) activity via 1191:Overview of vertebrate digestion 833: 817: 393:opens, partially digested food ( 353:. Gastric juice mainly contains 134:For the industrial process, see 36: 2813:US National Library of Medicine 2707:"The Alimentary Canal in Birds" 2467:Journal of General Microbiology 2020:Gastroesophageal reflux disease 333:. It will then travel down the 146:. For the term in alchemy, see 47:needs additional citations for 2751:Kong F, Singh RP (June 2008). 1995:Digestive system of gastropods 369:, gastric juice also contains 1: 3264:Bile and pancreatic secretion 2987:NIH guide to digestive system 2206:10.1016/j.physbeh.2015.07.017 1934:migrating myoelectric complex 1870:system) have been uncovered. 1023:Digestive system of ruminants 998:to feed newly hatched birds. 2982:Human Physiology – Digestion 2946:10.1371/journal.pone.0134116 2684:10.1016/j.actbio.2006.09.004 2636:10.1371/journal.ppat.0040008 2292:Dusenbery, David B. (2009). 1853:-IF complexes in the blood. 1343:human gastrointestinal tract 2365:Nature Reviews Microbiology 2097:(3rd ed.). St. Louis: 1524:, which in turn stimulates 3623: 3484:Interstitial cell of Cajal 2318:. Caister Academic Press. 2314:Wooldridge K, ed. (2009). 2158:10.1152/ajpcell.00102.2004 1921:Gastric inhibitory peptide 1833:molecules which rebind to 1769: 1696: 1654: 1453:take place including: the 1414:are covered with numerous 1300: 1289:occurs in the stomach and 1020: 955: 886: 743:with ingested erythrocytes 607:is the prototypic system. 520: 321:). About 30% of starch is 133: 3559:Enterohepatic circulation 3415:Segmentation contractions 3018:Resources in your library 2809:"Genetics Home Reference" 2193:Physiology & Behavior 1795:Non-destructive digestion 1647:to smaller polypeptides. 605:Agrobacterium tumefaciens 601:Agrobacterium tumefaciens 569:type III secretion system 430:) is eliminated from the 253:segmentation contractions 231:. Digestion is a form of 194: 2243:Human Biology and Health 2094:Principles of Physiology 2039:Avraham, Regina (1989). 1559:Breakdown into nutrients 1349:Digestion begins in the 534:Channel transport system 405:and bile juice from the 3489:Basal electrical rhythm 3420:Migrating motor complex 3058:gastrointestinal system 2852:10.3945/ajcn.111.013458 2508:Genes & Development 2480:10.1099/00221287-49-1-1 1772:nucleic acid metabolism 1703:Carbohydrate catabolism 1699:Carbohydrate metabolism 1390:as a thick semi-liquid 1361:and swallowed into the 1297:Human digestion process 1130:Other animals, such as 724:In a plant such as the 678:outer membrane vesicles 557:Pseudomonas fluorescens 545:membrane fusion protein 391:pyloric sphincter valve 142:. For the journal, see 3444:Enteric nervous system 2726:Levi, Wendell (1977). 2549:Molecular Microbiology 1866: 1810:. To digest vitamin B 1693:Carbohydrate digestion 1673:from the pancreas and 1338: 1303:Human digestive system 1291:gastrointestinal tract 1109:Specialised behaviours 1105: 1013: 744: 692: 674:gram-negative bacteria 549:outer membrane protein 513: 468:gastrointestinal tract 462:back to the organism. 349:in the stomach starts 268:human digestive system 196:Anatomical terminology 3358:Enterochromaffin cell 3353:Enteroendocrine cells 2294:Living at Micro Scale 1967:non-specific immunity 1864: 1766:DNA and RNA digestion 1697:Further information: 1336: 1103: 1011: 828:'s seed-shearing beak 787:Entamoeba histolytica 741:Entamoeba histolytica 735: 702:gastrovascular cavity 696:Gastrovascular cavity 686: 591:Conjugation machinery 491: 3346:Endocrine cell types 2992:The Digestive System 2042:The Digestive System 1849:and circulation of B 1273:are produced in the 1071:volatile fatty acids 770:cellular compartment 496:Donor cell produces 237:mechanical digestion 56:improve this article 3372:Exocrine cell types 3305:Glucose homeostasis 2937:2015PLoSO..1034116B 2598:Scientific American 2521:10.1101/gad.1299905 1814:non-destructively, 1746:lactose intolerance 1451:phases of digestion 294:hydrogencarbonate ( 177:systema digestorium 148:Digestion (alchemy) 144:Digestion (journal) 136:Anaerobic digestion 3495:Gastrocolic reflex 3056:Physiology of the 2671:Acta Biomaterialia 2414:Annu Rev Microbiol 2377:10.1038/nrmicro753 1941:Significance of pH 1925:insulin secretion. 1867: 1857:Digestive hormones 1549:sympathetic fibers 1357:by the mechanical 1339: 1106: 1061:Fibre, especially 1014: 745: 693: 514: 257:chemical digestion 3589: 3588: 3567: 3566: 3517: 3516: 3513: 3512: 3452:Submucous plexus 3438: 3437: 3387: 3386: 3239: 3238: 3004:Library resources 2898:10.1021/jm900777v 2892:(16): 5253–5261. 2840:Am. J. Clin. Nutr 2737:978-0-85390-013-9 2514:(22): 2645–2655. 2325:978-1-904455-42-4 2302:978-0-674-03116-6 2254:978-0-13-981176-0 1887:hydrochloric acid 1845:receptors enable 1808:functional groups 1785:deoxyribonuclease 1671:pancreatic lipase 1599:Protein digestion 1596: 1595: 1553:pyloric sphincter 1530:hydrochloric acid 1478:medulla oblongata 1375:hydrochloric acid 1271:digestive enzymes 1118:pigeons and doves 871:The mouth of the 689:Dionaea muscipula 563:Molecular syringe 517:Secretion systems 355:hydrochloric acid 351:protein digestion 341:by the action of 241:digestive enzymes 210: 209: 205: 132: 131: 124: 106: 16:(Redirected from 3614: 3602:Digestive system 3581:Peritoneal fluid 3543:Pancreatic juice 3528: 3470: 3457:Myenteric plexus 3399:Intestinal juice 3261: 3248: 3160:Gastric emptying 3112:Intrinsic factor 3078: 3071: 3050: 3043: 3036: 3027: 3009:Digestive system 2969: 2968: 2958: 2948: 2916: 2910: 2909: 2880: 2874: 2873: 2863: 2846:(1): 359S–365S. 2831: 2825: 2824: 2822: 2820: 2805: 2799: 2794: 2783: 2782: 2772: 2748: 2742: 2741: 2723: 2717: 2716: 2714: 2713: 2702: 2696: 2695: 2665: 2659: 2658: 2648: 2638: 2614: 2608: 2607: 2605: 2604: 2589: 2583: 2582: 2572: 2540: 2534: 2533: 2523: 2499: 2493: 2492: 2482: 2454: 2448: 2447: 2437: 2405: 2399: 2398: 2388: 2356: 2350: 2336: 2330: 2329: 2311: 2305: 2290: 2284: 2273: 2267: 2266: 2246: 2236: 2227: 2226: 2208: 2184: 2178: 2177: 2137: 2131: 2130: 2128: 2127: 2089:Levy, Matthew N. 2085:Berne, Robert M. 2081: 2075: 2074: 2072: 2071: 2036: 1948:Salivary amylase 1835:intrinsic factor 1591: 1588: 1570: 1563: 1463:intestinal phase 1412:epithelial cells 1404:intestinal juice 1400:pancreatic juice 1309: 1230:active transport 988:alimentary tract 861:ecological niche 837: 821: 790:can phagocytose 553:Escherichia coli 442:Digestive system 320: 314: 308: 302: 280:salivary amylase 202:edit on Wikidata 156:Digestive system 153: 127: 120: 116: 113: 107: 105: 64: 40: 32: 21: 3622: 3621: 3617: 3616: 3615: 3613: 3612: 3611: 3592: 3591: 3590: 3585: 3563: 3547: 3509: 3461: 3434: 3403: 3383: 3367: 3341: 3299: 3276:Cholecystokinin 3235: 3185: 3164: 3138: 3127: 3060: 3054: 3024: 3023: 3022: 3012: 3011: 3007: 2978: 2973: 2972: 2931:(7): e0134116. 2918: 2917: 2913: 2882: 2881: 2877: 2833: 2832: 2828: 2818: 2816: 2807: 2806: 2802: 2795: 2786: 2750: 2749: 2745: 2738: 2725: 2724: 2720: 2711: 2709: 2704: 2703: 2699: 2667: 2666: 2662: 2616: 2615: 2611: 2602: 2600: 2591: 2590: 2586: 2542: 2541: 2537: 2501: 2500: 2496: 2461:Vibrio cholerae 2456: 2455: 2451: 2407: 2406: 2402: 2358: 2357: 2353: 2337: 2333: 2326: 2313: 2312: 2308: 2291: 2287: 2274: 2270: 2255: 2238: 2237: 2230: 2186: 2185: 2181: 2139: 2138: 2134: 2125: 2123: 2113: 2083: 2082: 2078: 2069: 2067: 2057: 2038: 2037: 2033: 2028: 1991: 1979:pancreatic duct 1952:monosaccharides 1943: 1911:Cholecystokinin 1859: 1852: 1840: 1832: 1828: 1821: 1813: 1804: 1797: 1778:mononucleotides 1774: 1768: 1705: 1695: 1659: 1653: 1601: 1592: 1586: 1583: 1576:needs expansion 1561: 1470:cerebral cortex 1447: 1335: 1307: 1305: 1299: 1193: 1161: 1111: 1038:in the case of 1025: 1019: 980: 960: 954: 919:mucous membrane 891: 885: 863:. For example, 850: 845: 844: 843: 842: 841: 838: 830: 829: 822: 800: 792:red blood cells 750: 698: 687:Venus Flytrap ( 670: 612:nitrogen-fixing 593: 565: 536: 525: 519: 444: 425: 316: 310: 304: 300: 295: 276:salivary glands 225:small intestine 206: 151: 128: 117: 111: 108: 65: 63: 53: 41: 28: 23: 22: 15: 12: 11: 5: 3620: 3618: 3610: 3609: 3604: 3594: 3593: 3587: 3586: 3584: 3583: 3577: 3575: 3573:Abdominopelvic 3569: 3568: 3565: 3564: 3562: 3561: 3555: 3553: 3549: 3548: 3546: 3545: 3540: 3534: 3532: 3525: 3519: 3518: 3515: 3514: 3511: 3510: 3508: 3507: 3502: 3497: 3492: 3486: 3476: 3474: 3467: 3463: 3462: 3460: 3459: 3454: 3448: 3446: 3440: 3439: 3436: 3435: 3433: 3432: 3427: 3422: 3417: 3411: 3409: 3405: 3404: 3402: 3401: 3395: 3393: 3389: 3388: 3385: 3384: 3382: 3381: 3375: 3373: 3369: 3368: 3366: 3365: 3360: 3355: 3349: 3347: 3343: 3342: 3340: 3339: 3338: 3337: 3327: 3326: 3325: 3314: 3312: 3301: 3300: 3298: 3297: 3296: 3295: 3285: 3284: 3283: 3273: 3271:Enterogastrone 3267: 3265: 3258: 3245: 3241: 3240: 3237: 3236: 3234: 3233: 3232: 3231: 3221: 3220: 3219: 3209: 3208: 3207: 3196: 3194: 3187: 3186: 3184: 3183: 3178: 3172: 3170: 3166: 3165: 3163: 3162: 3157: 3152: 3146: 3144: 3140: 3139: 3137: 3136: 3135: 3134: 3129: 3125: 3119:Foveolar cells 3116: 3115: 3114: 3109: 3102:Parietal cells 3099: 3098: 3097: 3086: 3084: 3075: 3068: 3062: 3061: 3055: 3053: 3052: 3045: 3038: 3030: 3021: 3020: 3014: 3013: 3002: 3001: 3000: 2999: 2994: 2989: 2984: 2977: 2976:External links 2974: 2971: 2970: 2911: 2875: 2826: 2800: 2784: 2743: 2736: 2718: 2697: 2678:(1): 139–149. 2660: 2623:PLOS Pathogens 2609: 2592:Leege, Lissa. 2584: 2555:(2): 545–558. 2535: 2494: 2449: 2420:(1): 451–485. 2400: 2371:(2): 137–149. 2351: 2331: 2324: 2306: 2285: 2268: 2253: 2228: 2179: 2132: 2111: 2076: 2055: 2030: 2029: 2027: 2024: 2023: 2022: 2017: 2012: 2007: 2002: 1997: 1990: 1987: 1942: 1939: 1938: 1937: 1927: 1918: 1908: 1890: 1879:gastric glands 1858: 1855: 1850: 1838: 1837:(IF). These B 1830: 1826: 1819: 1811: 1802: 1796: 1793: 1770:Main article: 1767: 1764: 1713:polysaccharide 1694: 1691: 1663:lingual lipase 1655:Main article: 1652: 1649: 1600: 1597: 1594: 1593: 1573: 1571: 1560: 1557: 1526:parietal cells 1455:cephalic phase 1446: 1443: 1301:Main article: 1298: 1295: 1267:cephalic phase 1245: 1244: 1237: 1222: 1207: 1192: 1189: 1160: 1157: 1110: 1107: 1079:propionic acid 1067:hemi-cellulose 1021:Main article: 1018: 1015: 979: 976: 956:Main article: 953: 950: 887:Main article: 884: 881: 849: 846: 839: 832: 831: 826:Catalina Macaw 823: 816: 815: 814: 813: 812: 799: 796: 782:phagolysosomes 749: 746: 697: 694: 669: 666: 592: 589: 564: 561: 535: 532: 521:Main article: 518: 515: 443: 440: 423: 208: 207: 198: 192: 191: 186: 180: 179: 174: 168: 167: 163: 162: 158: 157: 130: 129: 44: 42: 35: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 3619: 3608: 3605: 3603: 3600: 3599: 3597: 3582: 3579: 3578: 3576: 3574: 3570: 3560: 3557: 3556: 3554: 3550: 3544: 3541: 3539: 3536: 3535: 3533: 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3019: 3016: 3015: 3010: 3005: 2998: 2995: 2993: 2990: 2988: 2985: 2983: 2980: 2979: 2975: 2966: 2962: 2957: 2952: 2947: 2942: 2938: 2934: 2930: 2926: 2922: 2915: 2912: 2907: 2903: 2899: 2895: 2891: 2887: 2879: 2876: 2871: 2867: 2862: 2857: 2853: 2849: 2845: 2841: 2837: 2830: 2827: 2814: 2810: 2804: 2801: 2798: 2793: 2791: 2789: 2785: 2780: 2776: 2771: 2766: 2763:(5): R67–80. 2762: 2758: 2754: 2747: 2744: 2739: 2733: 2729: 2722: 2719: 2708: 2701: 2698: 2693: 2689: 2685: 2681: 2677: 2673: 2672: 2664: 2661: 2656: 2652: 2647: 2642: 2637: 2632: 2628: 2624: 2620: 2613: 2610: 2599: 2595: 2588: 2585: 2580: 2576: 2571: 2566: 2562: 2558: 2554: 2550: 2546: 2539: 2536: 2531: 2527: 2522: 2517: 2513: 2509: 2505: 2498: 2495: 2490: 2486: 2481: 2476: 2472: 2468: 2464: 2462: 2453: 2450: 2445: 2441: 2436: 2431: 2427: 2423: 2419: 2415: 2411: 2404: 2401: 2396: 2392: 2387: 2382: 2378: 2374: 2370: 2366: 2362: 2355: 2352: 2349: 2348:1-55581-171-X 2345: 2341: 2335: 2332: 2327: 2321: 2317: 2310: 2307: 2303: 2299: 2295: 2289: 2286: 2282: 2281:0-7167-5060-0 2278: 2272: 2269: 2264: 2260: 2256: 2250: 2245: 2244: 2235: 2233: 2229: 2224: 2220: 2216: 2212: 2207: 2202: 2198: 2194: 2190: 2183: 2180: 2175: 2171: 2167: 2163: 2159: 2155: 2151: 2147: 2143: 2136: 2133: 2122: 2118: 2114: 2112:0-323-00813-5 2108: 2104: 2100: 2096: 2095: 2090: 2086: 2080: 2077: 2066: 2062: 2058: 2056:0-7910-0015-X 2052: 2048: 2044: 2043: 2035: 2032: 2025: 2021: 2018: 2016: 2013: 2011: 2008: 2006: 2003: 2001: 1998: 1996: 1993: 1992: 1988: 1986: 1984: 1980: 1974: 1972: 1968: 1964: 1960: 1959:carbohydrates 1955: 1953: 1949: 1940: 1935: 1931: 1928: 1926: 1922: 1919: 1916: 1912: 1909: 1906: 1902: 1898: 1894: 1891: 1888: 1884: 1880: 1876: 1873: 1872: 1871: 1863: 1856: 1854: 1848: 1844: 1836: 1823: 1817: 1809: 1805: 1794: 1792: 1790: 1786: 1783: 1779: 1773: 1765: 1763: 1761: 1757: 1753: 1749: 1747: 1743: 1739: 1735: 1732: 1728: 1724: 1722: 1718: 1714: 1710: 1704: 1700: 1692: 1690: 1688: 1684: 1680: 1676: 1672: 1668: 1664: 1658: 1651:Fat digestion 1650: 1648: 1646: 1642: 1638: 1634: 1630: 1626: 1622: 1621:exopeptidases 1618: 1614: 1610: 1606: 1598: 1590: 1581: 1577: 1574:This section 1572: 1569: 1565: 1564: 1558: 1556: 1554: 1550: 1546: 1541: 1539: 1535: 1534:acetylcholine 1531: 1527: 1523: 1519: 1515: 1511: 1510:acetylcholine 1507: 1503: 1498: 1496: 1493:secretion of 1492: 1488: 1483: 1479: 1475: 1471: 1466: 1464: 1460: 1459:gastric phase 1456: 1452: 1444: 1442: 1440: 1436: 1432: 1428: 1423: 1421: 1417: 1413: 1409: 1405: 1401: 1397: 1393: 1389: 1384: 1380: 1376: 1372: 1371:Gastric juice 1368: 1364: 1360: 1356: 1352: 1347: 1344: 1304: 1296: 1294: 1292: 1288: 1284: 1280: 1276: 1272: 1268: 1264: 1259: 1257: 1252: 1250: 1242: 1238: 1235: 1231: 1227: 1223: 1220: 1216: 1212: 1208: 1205: 1202: 1201: 1200: 1198: 1190: 1188: 1186: 1182: 1178: 1174: 1170: 1166: 1159:In earthworms 1158: 1156: 1152: 1150: 1146: 1141: 1137: 1133: 1128: 1126: 1121: 1119: 1115: 1114:Regurgitation 1108: 1102: 1098: 1094: 1092: 1088: 1084: 1080: 1076: 1072: 1068: 1064: 1059: 1057: 1053: 1049: 1045: 1041: 1037: 1033: 1030:have evolved 1029: 1024: 1016: 1010: 1006: 1004: 999: 997: 993: 989: 985: 977: 975: 973: 969: 964: 959: 951: 949: 947: 943: 939: 934: 932: 928: 924: 920: 916: 912: 908: 905:for chewing ( 904: 900: 896: 890: 882: 880: 878: 874: 869: 866: 862: 858: 854: 847: 836: 827: 820: 811: 809: 805: 797: 795: 793: 789: 788: 784:. In humans, 783: 779: 775: 771: 767: 766:cell membrane 763: 759: 755: 747: 742: 738: 734: 730: 727: 726:Venus flytrap 722: 720: 716: 712: 708: 703: 695: 690: 685: 681: 679: 675: 667: 665: 663: 659: 655: 651: 646: 644: 643:endosymbionts 640: 636: 632: 628: 627: 626:Agrobacterium 622: 618: 617: 613: 608: 606: 602: 598: 590: 588: 586: 582: 578: 574: 570: 562: 560: 558: 554: 550: 546: 542: 533: 531: 529: 524: 516: 511: 507: 503: 499: 495: 490: 486: 484: 480: 476: 471: 469: 466:have a tube ( 465: 461: 457: 453: 449: 441: 439: 437: 433: 429: 421: 417: 413: 408: 404: 400: 397:) enters the 396: 392: 387: 385: 381: 377: 372: 368: 364: 360: 356: 352: 348: 347:Gastric juice 344: 340: 337:and into the 336: 332: 328: 324: 319: 313: 307: 301: 293: 289: 285: 281: 277: 273: 269: 264: 262: 258: 254: 250: 246: 242: 238: 234: 230: 226: 222: 218: 214: 203: 197: 193: 190: 187: 185: 181: 178: 175: 173: 169: 164: 159: 154: 149: 145: 141: 137: 126: 123: 115: 104: 101: 97: 94: 90: 87: 83: 80: 76: 73: –  72: 68: 67:Find sources: 61: 57: 51: 50: 45:This article 43: 39: 34: 33: 30: 19: 3499: 3379:Goblet cells 3224:Somatostatin 3191:Gastric acid 3181:Gastric acid 3107:Gastric acid 3008: 2928: 2924: 2914: 2889: 2886:J. Med. Chem 2885: 2878: 2843: 2839: 2829: 2817:. Retrieved 2812: 2803: 2760: 2756: 2746: 2727: 2721: 2710:. Retrieved 2700: 2675: 2669: 2663: 2626: 2622: 2612: 2601:. Retrieved 2597: 2587: 2552: 2548: 2538: 2511: 2507: 2497: 2470: 2466: 2460: 2452: 2417: 2413: 2403: 2368: 2364: 2354: 2339: 2334: 2315: 2309: 2293: 2288: 2271: 2242: 2196: 2192: 2182: 2152:(1): C1–19. 2149: 2145: 2135: 2124:. Retrieved 2093: 2079: 2068:. Retrieved 2041: 2034: 1975: 1956: 1944: 1915:gall bladder 1895:– is in the 1868: 1847:assimilation 1824: 1798: 1789:ribonuclease 1775: 1750: 1731:disaccharide 1725: 1706: 1683:triglyceride 1667:diglycerides 1660: 1641:enterokinase 1625:dipeptidases 1617:polypeptides 1613:chymotrypsin 1602: 1584: 1580:adding to it 1575: 1551:causing the 1542: 1518:gastric acid 1499: 1495:somatostatin 1474:hypothalamus 1467: 1448: 1424: 1420:surface area 1410:, and their 1348: 1340: 1260: 1253: 1246: 1213:with water, 1194: 1162: 1153: 1129: 1122: 1112: 1095: 1083:butyric acid 1060: 1026: 1000: 981: 972:canine teeth 965: 961: 935: 894: 892: 870: 851: 801: 785: 762:phagocytosis 751: 740: 737:Trophozoites 723: 699: 688: 671: 662:Agrobacteria 661: 653: 649: 647: 624: 614: 609: 604: 600: 594: 584: 580: 576: 572: 566: 556: 552: 537: 526: 509: 505: 501: 493: 472: 445: 388: 327:disaccharide 265: 256: 236: 229:blood stream 221:blood plasma 212: 211: 176: 118: 109: 99: 92: 85: 78: 66: 54:Please help 49:verification 46: 29: 3480:Peristalsis 3466:Either/both 3425:Borborygmus 3090:Chief cells 2757:J. 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Anaerobic digestion
Precipitation (chemistry) § Digestion
Digestion (journal)
Digestion (alchemy)
Latin
MeSH
D004063
Anatomical terminology
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food
blood plasma
small intestine
blood stream
catabolism
digestive enzymes
mouth
mastication
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