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What is the heart and circulation's primary purpose?
To move substances around the body
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In very small organisms, such as unicellular creatures, substances such as oxygen CO2 and digestive products are moved around by?
Diffusion
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What is diffusion?
The movement of molecules or ions from a region of their high to a region of their low concentration by relatively slow random movement of molecules
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Most complex multicellular organisms are too large for diffusion to move substances around their bodies quickly enough. What do these animals have?
A heart and circulatory system.
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Open circulatory systems
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Card 2

Front

In very small organisms, such as unicellular creatures, substances such as oxygen CO2 and digestive products are moved around by?

Back

Diffusion

Card 3

Front

What is diffusion?

Back

Preview of the front of card 3

Card 4

Front

Most complex multicellular organisms are too large for diffusion to move substances around their bodies quickly enough. What do these animals have?

Back

Preview of the front of card 4

Card 5

Front

Open circulatory systems

Back

Preview of the front of card 5

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