Biology, asked by khushikaul1506, 4 days ago

What is heartbeat?? ​

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Answered by swati072010
5

Answer:

a heart beat is a two part pumping action that takes about a second. as blood collects in upper chambers the right and left atria, the earth's natural pacemaker the sa node sends out an electric signal that causes the atria to contact

Explanation:

don't ever give him unnie..

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