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6 Cards in this Set
- Front
- Back
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how does SA:vol ratio relate to the size of the organism?
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bigger size= smaller surface area to volume ratio
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what happens if you increase the size of the organism?
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increase in size, increases the distance from the surface to the centre of the organism
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what is materials needed to exchange, proportional to?
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the volume
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what is materials able to exchange, proportional to?
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S.A
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what are the features of an efficient exchange surface?
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large SA: vol ratio, increases rate of gas exchange
partially- permeable membrane means selected materials can exchange quickly thin surface means that there is a short diffusion pathway so materials can cross rapidly moist so gasses can dissolve in water and enter cells |
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What is Tick's law?
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diffusion is affected by: SA, diffusion concentration and thickness of membrane
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