The pacemaker stimulates:

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(C) The pacemaker,also known as the $SA$ node (Sinoatrial node),is a specialized bundle of cardiac muscle fibers located in the right atrium of the he

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Rate of heart beat

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(C) The pacemaker,also known as the $SA$ node (Sinoatrial node),is a specialized bundle of cardiac muscle fibers located in the right atrium of the heart. It acts as the natural pacemaker because it has the ability to generate electrical impulses spontaneously. These electrical impulses spread through the heart,causing the cardiac muscles to contract in a rhythmic manner,thereby determining the heart rate. Therefore,the pacemaker stimulates the rate of heart beat.

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