(AQA GCSE B3.1.1) Exchange Surfaces

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  • Created by: Em
  • Created on: 17-04-13 17:07
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  • Exchange surfaces
    • Features of exchange surfaces
      • Large surface area
      • Efficient blood supply in animals
      • Ventilated
    • Examples
      • Alveoli have a large surface due to specific shape and the high number of them in lungs. Also fits all of the other features.
      • Villi in small intestine. Finger-like, have a large surface area due to this. Also are one cell thick and have capillaries, but are not well ventilated.
        • Each villus also is covered with micro villi -- Optimum surface area
        • Mitochondria  are also in the cells for energy for active transport of glucose, etc.


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