Exchange between organisms and their environment.

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  • Created by: elyornais
  • Created on: 11-02-15 19:19
What are four things that need to be interchanged between an organism and it's environment?
1.)Respiratory gases 2.)Nutrients 3.)Excretory products 4.)Heat
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Give two features that organisms have evolved for efficient gas exchange.
1.) A flattened shape so that no cell is ever far from the surface. 2.) Specialized exchange surfaces with large areas to increase the surface area to volume ratio.
2 of 5
Why would an exchange surface be very thin?
So that diffusion distance is short and materials cross the surface rapidly.
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What is diffusion directly proportional to?
Surface area*difference in concentration/ length of diffusion path.
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Why would there be movement of internal(blood)and environmental(air) medium?
To maintain a diffusion gradient.
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Other cards in this set

Card 2

Front

Give two features that organisms have evolved for efficient gas exchange.

Back

1.) A flattened shape so that no cell is ever far from the surface. 2.) Specialized exchange surfaces with large areas to increase the surface area to volume ratio.

Card 3

Front

Why would an exchange surface be very thin?

Back

Preview of the front of card 3

Card 4

Front

What is diffusion directly proportional to?

Back

Preview of the front of card 4

Card 5

Front

Why would there be movement of internal(blood)and environmental(air) medium?

Back

Preview of the front of card 5

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