The pacemaker stimulates the:

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(C) The pacemaker,also known as the $SA$ node (Sinoatrial node),is a specialized cluster of cells located in the right atrium of the heart.It acts as

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Rate of heartbeat

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(C) The pacemaker,also known as the $SA$ node (Sinoatrial node),is a specialized cluster of cells 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 muscle,causing it to contract in a rhythmic manner.Therefore,the primary function of the pacemaker is to initiate and regulate the rate of the heartbeat.

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