amylase - enzyme used in the digestion of starch in the mouth and the small intestine, bolus - partly digested food formed in the mouth, peristalsis - the contraction of muscles in the gut wall, pushing food through the digestive system, chyme - partly digested food formed in the stomach, hydrochloric acid - released in the stomach to kill bacteria, pepsin - enzyme used in the digestion of protein in the stomach, bile - made by the liver, stored in the gall bladder, and used in the digestion of fats, trypsin - enzyme used in the digestion of protein in the small intestine, lipase - enzyme used in the digestion of lipids in the small intestine, sodium hydrogen carbonate - alkali substance made by the pancreas, used to neutralise the acid from the stomach, villi - found in the small intestine, absorb the products of digestion into the blood using their large surface area, faeces - undigestable material, compacted and released by the anus, emulsification - breakdown of fats into smaller droplets, requiring bile,

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