In humans,an artificial pacemaker is implante | vedclass

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(A) The $SA$ (Sino-Atrial) node is known as the natural pacemaker of the heart because it initiates the rhythmic contractile activity of the heart by

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$SA$ node

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(A) The $SA$ (Sino-Atrial) node is known as the natural pacemaker of the heart because it initiates the rhythmic contractile activity of the heart by generating action potentials.If the $SA$ node becomes defective or fails to function properly,the heart's electrical conduction system is disrupted,leading to an irregular or slow heartbeat (bradycardia).In such cases,an artificial pacemaker is surgically implanted to provide the necessary electrical impulses to maintain a normal heart rate.

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

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