Biology, asked by sakthipk, 2 months ago

explain the condition of the heart beat

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Answered by MiraculousBabe

17

Answer:

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.

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