what are different components of heartbeat
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Answer:
The SA node (called the pacemaker of the heart) sends out an electrical impulse. The upper heart chambers (atria) contract. The AV node sends an impulse into the ventricles. The lower heart chambers (ventricles) contract or pump.
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Explanation:
• the systole is the when the heart contracts and pumps blood.
• the diastole is when the heart releases, after contraction, so the chambers can refill with blood.
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