surface area to volume ratio

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  • Created by: s.yos
  • Created on: 03-02-16 19:42

Diffusion is increases by:

1) large surface area

2) steep concentration gradient

3) thin surface membrane

4) heat

5) good blood supply (maintains steep concentration gradient )

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Fick's Law

-Measures rate of diffusion

Copyright S-cool (http://www.s-cool.co.uk/assets/learn_its/alevel/biology/gas-exchange/general-principles-for-efficient-gas-exchange/image1.gif)

- 'a' means proportional to

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Unicellular organisms

- Do not have specialised gas exchange surfaces

-Use diffusion

-The smaller something is, the smaller the surface area & the bigger the surface area:volume ratio.

-All parts of organism supplied w/ oxygen because diffusion distance is short

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