Efficient exchange surface

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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.
    • 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


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