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beating of the heart
IV or V


Sagot :

Answer:

What is the beating of the heart?

Image result for beating of the heart IV or V

A heartbeat is a two-part pumping action that takes about a second. As blood collects in the upper chambers (the right and left atria), the heart's natural pacemaker (the SA node) sends out an electrical signal that causes the atria to contract

Explanation:

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