Digestion
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The digestive process is one of the most complex processes in the human body. There are eight stages in the digestive process from the time we ingest food into the mouth and excrete it from the anus. The eight stages include the following in order of process: mouth, esophagus, stomach, small intestine, jejunum/ileum, colon, rectum, anus. The salivary glands in the mouth, along with mastication, begin the digestion process. The salivary glands secrete enzymes like salivary amylase. Peristalsis begins in the esophagus which is an involuntary reflex that helps move food toward the stomach. Mucus is secreted at this stage. Food is stored in the stomach for up to a period of four hours and involves mechanical and chemical digestion like the mouth. Physical contact secretes pepsin and chemical digestion is achieved through the secretion of gastrin. Once the food is into the duodenum of the small intestine chemical digestion continues to occur. The pancreas secretes enzymes which break down polysaccharides and polypeptides and the intestine releases peptidases, sucrase, multase, lactase and other enzymes which break down disaccharides into monosaccharides. Lipase breaks down fats into glycerol and fatty acids. The gall bladder secretes bile once the digestive process reaches the jejunum/ileum. The food then moves to the colon where it is absorbed into the blood stream over a twelve hour period, during which time mucus is secreted a
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Digestion Nutrition, Sears' Zone, Encarta CD-ROM, Sreenivasarao Balanced, balanced diet, liver serves, food pyramid, chemical digestion, digestive process, balanced diet available, traditional food pyramid, pp 1-2, pp 1, carbohydrates proteins, enzymes break, 2-3 servings,
Approximate Word count = 963
Approximate Pages = 4 (250 words per page)
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