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Card 16

Front

Why do animals need a blood circulatory system?

Back

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Card 17

Front

Describe the circuit in a single circulatory system?

Back

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Card 18

Front

Describe the circuits in a double circulatory system?

Back

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Card 19

Front

Why does a double circulatory system require a four chambered heart?

Back

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Card 20

Front

Why does a single circulatory system require a two chambered heart?

Back

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Card 21

Front

What did Galen do?

Back

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Card 22

Front

What did William Harvey do?

Back

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Card 23

Front

What is the cardiac cycle?

Back

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Card 24

Front

How is blood prevented from flowing in the wrong direction?

Back

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Card 25

Front

What does more muscular activity cause?

Back

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