Simple IB Biology

#6.1 Human Physiology - Digestion and Absorption

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In this sub-unit we are going to explain the concepts of:


  • The contraction of circular and longitudinal muscle of the small intestine mixes the food with enzymes and moves it along the gut
    • Enzymes digest most macromolecules in food into monomers in the small intestine
    • The pancreas secretes enzymes into the lumen of the small intestine
    • Villi increases the surface area of epithelium over which absorption is carried out
    • Villi absorb monomers formed by digestion as well as mineral ions and vitamins
    • Different methods of membrane transport are required to absorb different nutrients
      • ...more
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      Simple IB BiologyBy Amirali Ghajari