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Tatum Randolph
29 October, 05:41
What is the pacemaker of the heart
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Cedric Buckley
29 October, 06:26
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The sinoatrial (SA) node or sinus node is the heart's natural pacemaker. It's a small mass of specialized cells in the top of the right atrium (upper chamber of the heart). It produces the electrical impulses that cause your heart to beat ... It allows the pacemaker to fire when the heartbeat is too slow.
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Dixie Steele
29 October, 08:40
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It is the sinus node
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