What is a pacemaker?

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(D) The $SA$ node (Sinoatrial node) is a specialized bundle of cardiac muscle fibers located in the right atrium of the heart.It is known as the natur

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The $SA$ node that initiates heart impulses

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(D) The $SA$ node (Sinoatrial node) is a specialized bundle of cardiac muscle fibers located in the right atrium of the heart.It is known as the natural pacemaker of the heart because it generates electrical impulses that initiate and regulate the rhythmic contraction of the heart muscle.These impulses spread through the heart,causing it to beat at a regular rate.

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