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    Building a Medical Vocabulary Study Set 1
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    Exam 4: Circulatory System
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    What Causes the Heart to Contract
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What Causes the Heart to Contract

Question 93

Question 93

Multiple Choice

What causes the heart to contract?


A) The cardiac center in the brain
B) Chemicals produced by the brain and transported by the blood
C) The atrioventricular valve
D) The sinoatrial node

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