Exchange between organisms and their environment.

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.

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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

Card 4

Front

What is diffusion directly proportional to?

Back

Card 5

Front

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

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Exchange between organisms and their environment.