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(A) The $SA$ node (Sinoatrial node) is known as the natural pacemaker of the human heart because it generates the electrical impulses that initiate th

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$SA$ node

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(A) The $SA$ node (Sinoatrial node) is known as the natural pacemaker of the human heart because it generates the electrical impulses that initiate the heartbeat. If the $SA$ node becomes defective or fails to function properly,it leads to conditions like bradycardia or heart block,where the heart rate becomes abnormally slow or irregular. In such cases,an artificial pacemaker is surgically implanted to provide the necessary electrical stimulation to maintain a normal heart rhythm.

In man,an artificial pacemaker is implanted due to defects in:

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