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S5 Small Intestines II

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Station 5 Small intestines II

Station 5 Small intestines II


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  • 1. Mouth EsophagusStomachSmall intestine
  • 2. Absorption of nutrients in the small intestines
    6.4 pg 102 What is Absorption?
    http://www.yenching.edu.hk/biology/absorption.swf
  • 3. Adaptation of the small intestines for absorption
    1. Surface Area
    2. Thin membrane
    3. Concentration gradient
    • Inner walls have numerous walls
    • 4. Lined with vili
    • 5. Microvilli on villi
    • 6. 1 cell thick epithelium
    Many capillaries to carry substance away quickly
    Each villus is a lacteal or lymphatic capillary surrounded by blood capillaries.
    This continuous transport of digested food substances away from the villus maintains the concentration gradient for absorption.
  • 7. Increased intestinal surface area
    1 cell thick epithelium
  • 8. Q. How is Concentration gradient maintained at the site of the intestinal villus?
    A concentration gradient is
    maintained
    at the villus
    by the continual transport of digested food substances away from the villus.
  • 9. How does absorption take place?
    Legend
    Glucose
    amino acids
    fatty acid &
    glycerol
    fat molecule
  • 10. Glucose & amino acids diffuses into blood capillaries of villi
    Glucose & amino acids also enters via active transport
    Glycerol & fatty acid diffuse into the epithelium, then combines back when they enter lacteal
    Water & mineral salts also absorbed.
    How does absorption take place?