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The contraction of the heart is initiated by a small cluster of cardiac muscle cells called what? Answer:

The contraction of the heart is initiated by a small cluster of cardiac muscle cells called what? Answer:
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The contraction of the heart is initiated by a small cluster of cardiac muscle cells called what? Answer:

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User Mackross
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1 Answer

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Sinoatrial (SA) Node
answered
User Mark Sherretta
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