4chapter38

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4chapter38

  1. 1. Digestive and Excretory Systems By Daria Tugwell
  2. 2. The Process of Digestion The Mouth: <ul><li>Where the digestive system begins </li></ul><ul><li>Begins process of mechanical digestion </li></ul><ul><li>Digestive enzymes break down food molecules </li></ul>
  3. 3. The Esophagus and Stomach <ul><li>Tongue and Throat push bolus down into esophagus </li></ul><ul><li>Food from esophagus put into the stomach, a muscular sac </li></ul><ul><li>Pepsin and hydrochloric acid used to start protein digestion process </li></ul><ul><li>Stomach produces chyme </li></ul>
  4. 4. The Pancreas and Liver <ul><li>Pancreas; a gland with three functions </li></ul><ul><li>Produce hormones </li></ul><ul><li>Produces enzymes </li></ul><ul><li>And produces sodium bicarbonate </li></ul><ul><li>Liver produces bile that makes enzymes break down fat molecules </li></ul>
  5. 5. Small and Large Intestine <ul><li>Chyme goes into jejunm and ileum </li></ul><ul><li>SMALL INTESTINE- </li></ul><ul><li>Huge surface area and nutrient-free </li></ul><ul><li>LARGE INTESTINE- </li></ul><ul><li>Main job is to remove water from the undigested material </li></ul>
  6. 6. The Excretory System The Kidneys: <ul><li>2 Main organs of excratory system </li></ul><ul><li>Blood goes into kidney through renal artery </li></ul><ul><li>Waste products are collected as urine </li></ul><ul><li>The filtered blood is returned to the cycle </li></ul>
  7. 7. Kidney Structure <ul><li>Inner: Renal medulla </li></ul><ul><li>Outer: Renal cortex </li></ul><ul><li>Nephron: Functional unit </li></ul><ul><li>About 1 million in each kidney </li></ul>
  8. 8. Filtration and Reabsorption <ul><li>Filtration: Glomerulus and Bowman’s capsule help nephron filter </li></ul><ul><li>Reabsorption: Most material goes back into blood </li></ul><ul><li>*Kidneys filter blood every 45 minutes </li></ul>
  9. 9. Control of Kidney Function <ul><li>Important for homeostasis </li></ul><ul><li>It regulates water content in blood </li></ul>

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