Efficient exchange surface
- Created by: Molly Webb
- Created on: 04-04-15 14:30
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- Efficient Exchange Surface
- Large SA
- The larger the area that a substance can diffuse across- the more substance can pass a surface in given time
- Thin
- The shorter the distance across- less time it takes
- Diffusion Gradient
- Across the exchange surface
- The conc on one side must be different so that the substance diffuses down conc gradient.
- Across the exchange surface
- Protected from drying out
- In terrestrial animal
- If 'wet' cells are exposed to dry air, water vapour will diffuse out
- If too much water vapour is lost- plasma membrane will lose structure
- If 'wet' cells are exposed to dry air, water vapour will diffuse out
- In terrestrial animal
- Large SA
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