What is a pacemaker?

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(D) The heart is myogenic,meaning its rhythmic contraction is initiated by specialized cardiac muscles. The $SA$ node (Sinoatrial node) is located in

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The $SA$ node that initiates heartbeats

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(D) The heart is myogenic,meaning its rhythmic contraction is initiated by specialized cardiac muscles. The $SA$ node (Sinoatrial node) is located in the right upper corner of the right atrium. It acts as the natural pacemaker of the heart because it has the highest rate of depolarization and generates the electrical impulses that set the rhythm of the heart contraction. Therefore,the $SA$ node is known as the pacemaker.

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