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The digestive system
Member rating: No Rating | Words: | Submitted: Wed Aug 27 2003
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THE DIGESTIVE SYSYTEM What are the five basic activities of the digestive system? The five basic activities of the digestive system are ingestion, digestion, absorption, assimilation and egestion. How does the digestive system work? Food enters the (1) mouth, which contains salivary glands that produces a carbohydrase enzyme called salivary amylase. The food is transported down the oesophagus (2) to the stomach (3), which pummels the food with its muscular walls; it produces the protease enzyme and hydrochloric acid to kill bacteria and to give the right pH for the protease enzyme to work. (pH 2) - acidic. In the liver (4) bile is produced which emulsifies fats and neutralises stomach acid making the conditions right for the enzymes in the small intestine. Bile is produced in the gall bladder. (5) The pancreas (6) produces all three-enzyme protease, carbohydrase and lipase. Leaving the pancreas food continues on into the small intestine (7) also producing...
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