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9 Digestive System

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9 Digestive System

  1. 1. HUMAN BIOLOGY DIGESTIVE SYSTEM
  2. 2. MOUTH <ul><li>Two types of digestion begin: </li></ul><ul><li>mechanical </li></ul><ul><li>chemical </li></ul><ul><li>Ptyalin - an enzyme in saliva begins to break down starches into sugars </li></ul>
  3. 3. PHARYNX <ul><li>This is an area at the back of the throat where the trachea and the esophagus begin. </li></ul>
  4. 4. ESOPHAGUS <ul><li>Here the food is pushed down the muscle lined tube. The process which is called peristalsis takes about 7 seconds. </li></ul><ul><li>Mainly mechanical, some chemical </li></ul>
  5. 5. STOMACH <ul><li>The food continues to be digested here for about 3-6 hours. High chemical and mechanical </li></ul><ul><li>HCl and Pepsin aid the chemical digestion taking place. Pepsin is responsible for breaking down protein. </li></ul>
  6. 6. SMALL INTESTINE <ul><li>The food, now called chyme , passes through this very long tube in about 3-5 hours. Chemical and Mechanical digestion </li></ul><ul><li>Here the nutrients are absorbed by the villi and microvilli . These are small fingerlike projections on the walls of the intestine. </li></ul>
  7. 7. SMALL INTESTINE <ul><li>The liver produces bile . </li></ul><ul><li>The gall bladder stores bile </li></ul><ul><li>The pancreas produces: </li></ul><ul><li>amylase </li></ul><ul><li>trypsin </li></ul><ul><li>lipase </li></ul><ul><li>All enzymes are sent to small intestine </li></ul>
  8. 8. LARGE INTESTINE <ul><li>What is left of the food remains here for 18-24 hours. </li></ul><ul><li>The water is absorbed through the walls of the large intestine and into the body. </li></ul>
  9. 9. RECTUM <ul><li>The waste is then passed out of the large intestine and into the rectum. </li></ul><ul><li>The waste then moves through the anus and out of the body. </li></ul>

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