A-LEVEL NOTES
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A-LEVEL NOTES

A-LEVEL BIOLOGY AQA NOTES 
surface area to volume ratio


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Surface Area to Volume Ratio
  • The greater the size of an organism, the smaller its surface area: volume ratio
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  • Larger organisms therefore require specialised exchange surfaces and transport mechanisms to meet their metabolic requirements
  • Specalised exchange surface have: a large surface area, thin barriers and associated transport systems to maintain a steep diffusion gradient.
  • Also, organisms with a higher metabolic rate require more nutrients and produce more waste, therefore require a specialised exchange surface

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