Gastrointestinal System (Digestive System)
Purpose <ul><li>Main Function: </li></ul><ul><ul><li>Digest food and make nutrients available for the rest of the body.  <...
Feedback loops <ul><li>Muscles use energy </li></ul><ul><li>Brain tells GI system to Brake down food faster and make more ...
Mouth <ul><li>Digestion begins </li></ul><ul><ul><li>Saliva - Enzymes </li></ul></ul><ul><ul><li>Mastication </li></ul></u...
Peristalsis <ul><li>Muscular contraction in the GI system that moves food through the body </li></ul><ul><li>Reverse Peris...
Esophagus <ul><li>Tube that leads from Mouth to Stomach. </li></ul><ul><li>Lined with involuntary muscles </li></ul><ul><l...
Epiglottis
Stomach <ul><li>Begins chemical digestion </li></ul><ul><ul><li>More enzymes and acids </li></ul></ul><ul><li>Low pH level...
Heartburn <ul><li>The heart is not involved. </li></ul><ul><li>When acid from stomach travels up the esophagus. </li></ul>...
Small Intestine <ul><li>22 feet long! </li></ul><ul><li>Further breakdown of food with bile. </li></ul><ul><li>Begins nutr...
Villi <ul><li>Wrinkles in lining of small and large intestine </li></ul><ul><li>Purpose: </li></ul><ul><ul><li>Increase su...
Large Intestine <ul><li>Most responsible for absorption </li></ul><ul><ul><li>Water from indigestible food </li></ul></ul>...
Summary <ul><li>The GI system plays an important role in our bodies. </li></ul><ul><li>It provides the rest of the body wi...
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Gastrointestinal System

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Gastrointestinal System

  1. 1. Gastrointestinal System (Digestive System)
  2. 2. Purpose <ul><li>Main Function: </li></ul><ul><ul><li>Digest food and make nutrients available for the rest of the body. </li></ul></ul>
  3. 3. Feedback loops <ul><li>Muscles use energy </li></ul><ul><li>Brain tells GI system to Brake down food faster and make more energy available. </li></ul><ul><li>You feel “Hungry” </li></ul><ul><li>Need to replace used energy stores. </li></ul>
  4. 4. Mouth <ul><li>Digestion begins </li></ul><ul><ul><li>Saliva - Enzymes </li></ul></ul><ul><ul><li>Mastication </li></ul></ul><ul><li>Prepares food for next voyage </li></ul>
  5. 5. Peristalsis <ul><li>Muscular contraction in the GI system that moves food through the body </li></ul><ul><li>Reverse Peristalsis: </li></ul><ul><li>when food comes back out. </li></ul>
  6. 6. Esophagus <ul><li>Tube that leads from Mouth to Stomach. </li></ul><ul><li>Lined with involuntary muscles </li></ul><ul><li>No digestion or absorption takes place here. </li></ul>
  7. 7. Epiglottis
  8. 8. Stomach <ul><li>Begins chemical digestion </li></ul><ul><ul><li>More enzymes and acids </li></ul></ul><ul><li>Low pH levels, kill off bacteria </li></ul><ul><li>Mechanical digestion </li></ul><ul><ul><li>Churning, squeezing </li></ul></ul>
  9. 9. Heartburn <ul><li>The heart is not involved. </li></ul><ul><li>When acid from stomach travels up the esophagus. </li></ul><ul><li>Esophagus is not protected from acid, and it begins to burn the lining of muscle. </li></ul>
  10. 10. Small Intestine <ul><li>22 feet long! </li></ul><ul><li>Further breakdown of food with bile. </li></ul><ul><li>Begins nutrient absorption. </li></ul><ul><li>3 Parts </li></ul><ul><ul><li>Duodenum </li></ul></ul><ul><ul><li>Jejunum </li></ul></ul><ul><ul><li>Ileum </li></ul></ul>
  11. 11. Villi <ul><li>Wrinkles in lining of small and large intestine </li></ul><ul><li>Purpose: </li></ul><ul><ul><li>Increase surface area </li></ul></ul><ul><li>Microvilli: each villus is covered in even smaller wrinkles </li></ul><ul><li>Purpose: </li></ul><ul><ul><li>Increase surface area </li></ul></ul>
  12. 12. Large Intestine <ul><li>Most responsible for absorption </li></ul><ul><ul><li>Water from indigestible food </li></ul></ul><ul><ul><li>Any nutrients the SI didn’t get </li></ul></ul><ul><li>Rectum stores waste to be expelled through anus. </li></ul>
  13. 13. Summary <ul><li>The GI system plays an important role in our bodies. </li></ul><ul><li>It provides the rest of the body with nutrients and energy. </li></ul><ul><li>It connects with the nervous system to inform us of when to eat. </li></ul><ul><li>The nervous system can also inform the GI system to prepare for incoming food. </li></ul>

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