Every ______of the heart is called a heartbeat
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SA node (sinoatrial node) – known as the heart's natural pacemaker. The impulse starts in a small bundle of specialized cells located in the right atrium, called the SA node. The electrical activity spreads through the walls of the atria and causes them to contract. This forces blood into the ventricles
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Beat is the answer...
Hope, it helps... :)
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