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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