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A-Level Biology OCR A

Thin Explain Layers Increase Efficiency Exchange Surfaces Distances

Thin layers, such as the alveoli in the lungs, enhance exchange efficiency by minimizing the diffusion distance for substances.

Thin layers, like those of the alveoli in the lungs, increase exchange efficiency by reducing the diffusion distance for substances.

Front Explain how thin layers increase efficiency of exchange surfaces. + example
Back Thin layers:
  • Distances that substances need to diffuse are short, increasing the rate of diffusion - more efficient
  • Example: alveoli in lungs 

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