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➜What do you understand by Pacemaker of heart ?
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A pacemaker is a small electronic device implanted under the skin that sends electrical impulses to the heart muscle to maintain a suitable heart rate and to prevent slow heart rates.
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Electrical impulses from the heart muscle cause your heart to beat (contract). This electrical signal begins in the sinoatrial (SA) node, located at the top of the heart's upper-right chamber (the right atrium). The SA node is sometimes called the heart's “natural pacemaker.”
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