Science, asked by zainabjaweria94, 1 month ago

plz answer this question plz

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Answered by mrssaroj2

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a-true,b-false ,c-true, d- 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.,e-true ,f- false ,g-true

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