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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