The lungs

  • Created by: siobhan
  • Created on: 04-05-13 14:21
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  • Exchange materials-the lungs
    • Oxygen is absorbed by the lungs and carbon dioxide is removed from them
    • Large surface area, thin walls or a short diffusion path are features that make an exchange surface efficient
    • the lungs contain the gaseous exchanges surface, the surface area of the lungs is increased by the alveoli
      • the alveoli have thin walls, a large surface area and a good blood supply
    • the lungs are ventilated to maintain a steep diffusion gradient
      • Oxygen diffuses into the many capillaries surrounding the alveoli and carbon dioxide diffuses back into the lungs from the blood to be exhaled out
  • Large organisms need exchange surface


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