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lakkis [162]
3 years ago
14

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

Health
1 answer:
Y_Kistochka [10]3 years ago
4 0
Sinoatrial (SA) Node
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What should schools be restricting and what should they be adding to the lunch menu?
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Hi !

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<em />

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