Diffusion through Cell Membranes

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  • Created by: Jo Wells
  • Created on: 02-04-13 14:05
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  • Diffusion through Cell Membranes
    • Gas Exchange
      • Happens in Lungs
        • To transfer oxygen to blood
        • To remove waste carbon dioxide
        • Lungs contain millions of alveoli
          • Enormous surface area
            • about 75m^2 in humans
          • Moist lining for dissolving gases
          • Very thin walls
          • A good blood supply
    • Villi
      • Inside the small intestine
      • Provide a really big surface area
        • So digested food is absorbed more quickly
      • A single layer of surface cells
      • A very good blood supply
        • Quick absorption


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