answer in short =what is a heartbeat? name the instrument used by doctors to listen to our heartbeats
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Heartbeats can easily be heard using a good stethoscope
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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.
Doctor listens to your heart with a stethoscope. The opening and closing of your valves make a "lub dub" sound known as heart sounds.
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