defination of Heartbeat for class 7th
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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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The wall of heart are made up of muscles , known as as caradic muscle .these muscular undergo contraction and relaxation in a rythmic manner , . one contraction and relxation make up on one heart beat it's class 7th okk
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