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12/9 Digestion after the stomach

12/9 Digestion after the stomach






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    12/9 Digestion after the stomach 12/9 Digestion after the stomach Presentation Transcript

    • Do Now
      Where would the digestion of fruit start?
      Where would the digestion of starch start?
      Which nutrients do you think could be absorbed without being digested in the gastrointestinal tract?
    • Do Now
      Fruit is a complex carbohydrate
      Digestion of sugars start in the mouth
      Starch is a complex carbohydrate
      Digestion of sugars start in the mouth
      Vitamins, Minerals, and Water
      No building blocks, right?
    • Aim: What happens to food after it moves out of the stomach?
    • A trip through the Gastrointestinal Tract…
      We enter through the mouth
      Become a bolus as we move through the esophagus
      Become chyme when we enter the stomach
    • After the stomach…
      CHYME enters the small intestines
    • Small Intestines
      Digestion is finished here; no digestion after
      Much of digestion takes place in first parts of the S.I.
      Absorption of nutrients occurs here!
      The surface of small intestines are covered with VILLI
      The surfaces of the villi are covered by MICROVILLI
    • Small Intestines
      Villi and Microvilli (villus and microvillus)
      Make the small intestine have HUGE SURFACE AREA…why?
      So the most possible absorption of nutrients can take place!
      Microvilli are like small fingers on finger! Huge surface area!
    • Which set of paper towels can absorb more?
    • After the small intestine…
      We enter the large intestine (colon)
      After the SI, much of the nutrients have been absorbed out of the chyme already
      All that’s left: water, cellulose, undigested material
    • Large Intestine (Colon)
      Main function of the colon: Absorbing Water
      If water cannot be absorbed – Diarrhea
      Think: if you don’t absorb the water, where does it go?
      To help food move better – Roughage
      Complex carbs, fiber, vegetables good sources of roughage
    • Enzymes in the Gastrointestinal System
      Mouth – salivary amylase
      Breaks down starches into smaller sugars
      Where carbohydrate digestion starts
      Stomach – pepsin
      Breaks down polypeptides into amino acids
      Where protein digestion starts
    • Enzymes in the Digestive System
      Small intestine gets enzymes from two places:
      1. the pancreas releases enzymes
      2. the small intestine lining secretes enzymes
    • Enzymes in the Digestive System
      Small intestine from pancreas
      Amylase – continues breakdown of carbohydrate, starch
      Trypsin – continues breakdown of protein
      Lipase – STARTS break down of fat
      NOTICE: lipase (lipid); fat digestion starts in the small intestine
      Small intestine from lining secretions
      Maltase, sucrase, lactase – breaks down carbs to sugars
      Peptidase – breaks down peptides into amino acids
    • Split into groups, work on packet
    • Digestive System
    • Citations
      All pictures taken from PowerPoint clipart and Google Pictures