AQA Biology- unit 2: 13.1 Exchange between organisms + their enviroment
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- Created on: 16-03-13 21:41
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- Exchange materials include: respirotary gases, nutrients, excretory products(e.g. urea) and thermal heat
- Exchange and transport
- Factors effecting exchange: size of organism, metabolic rate, surface area:volume ratio
- Specialised exchange surfaces have: very large SA:V ratio,thin and partially permeable exchange surface membrane, a diffusion gradient
- Exchange takes place by: diffusion and osmosis (passively), or by active transport (actively)
- Large organism with a small SA:V ratio have adapted by having a flattened shape or specialised exchange surface
- Exchange and transport
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