Science, asked by lalitakanyal55, 2 months ago

Mr heart beat very smart etna jitna Lekene Mein time lgaya hai utana Dimag lga le te​

Answers

Answered by sanjudnath
1

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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