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Created with Fabric.js 1.4.5 Digestion Of A Chicken Leg Chicken is bitten off the bone by the teeth.(Mechanical) After being chewed and swallowed. Peristalsis occurs. (muscles in esophagus move food down into the stomach) Gravity plays no part in this action. Acid in the stomach then begins the chemical breakdown process. Proteins in the chicken are broken down chemically by the enzyme pepsin. The protein is broken down into large polypeptides. This all occurs within the stomach. Large polypeptides are then broken down into small polypeptides and small peptides by pancreatic enzymes: trypsin, chymotrypsin, and carboxypeptidase. This all occurs within the small intestine. Absorption: Amino Acids enter the capillaries of the villi(microscopic "fingers" that grab the nutrients) then are transported to the liver via the hepatic portal vein. Protein breakdown Lipid (fat) Breakdown Unemulsified fats are broken down by detergent actionof bile salts from the liver (small intestine). Pancreatic lipase then breaks the lipids down intomonoglycerides, fatty acids, and glycerol. (Small intestine) Once in the large intestine, water is absorbed. (Mostly through the colon). The large intestine doesn't produce digestive enzymes like the pancreas, however it does have "resident" bacteria that metabolize some of the remaining nutrients. (Releasing gas: methane & hydrogen sulfide) What's left is feces. (feces, hehe) Which is the final product delivered to the rectum.It contains undigested food residue. When feces are in the rectum the walls expands, and the defecation reflex is initiated. (Pooping) Absorption: Absorbed primarily into the lactealsof the villi & transported in the lymph to the circulatory system.Glycerol & short-chain fatty acids are absorbed into the capillary blood in the villi & are then transported to the liver. Once the small peptides and small polypeptides are broken down,enzymes called aminopeptidase, carboxypeptidase and dipeptidase break them down further into amino acids (some dipeptides & tripeptides). This occurs still within the small intestine.
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