Fish circulatory system

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Last updated 5:40 PM on 4/13/26

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1

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What kind of circulatory system do they have?

Single

2

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How many atria and ventricles do they have?

1 atrium and 1 ventricle

3

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What does blood pass through before returning to the heart?

2 sets of capillaries (in mammals it is only 1 set)

4

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What is the blood pressure like?

Lower than mammals

5

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How does their circulatory system fulfill their needs?

Fish have a low oxygen demand, cold blooded, low metabolic rate