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Card 16

Front

What do the valves in the heart do?

Back

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Card 17

Front

How many coronary arteries are there?What do they do?

Back

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Card 18

Front

Why is the left ventricle wall thicker than the right ventricle?

Back

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Card 19

Front

Why do the atria have thinner walls?

Back

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Card 20

Front

How are chemicals exchanged?

Back

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Card 21

Front

Describe how chemicals are exchanged.

Back

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Card 22

Front

Chemical exchange continued.

Back

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Card 23

Front

What does tissue fluid allow cells to do?

Back

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Card 24

Front

What is the job of a skeleton?

Back

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Card 25

Front

What are vertebrates?Give examples.

Back

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