Sino-atrial node is called the pacemaker of o | vedclass

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(B) The sino-atrial $(SA)$ node is a specialized mass of cardiac muscle fibers located in the upper wall of the right atrium. It has the unique abilit

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It regulates the heart rate by initiating rhythmic contractions.

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(B) The sino-atrial $(SA)$ node is a specialized mass of cardiac muscle fibers located in the upper wall of the right atrium. It has the unique ability to generate action potentials without any external stimuli,a property known as autorhythmicity. Because the $SA$ node initiates and maintains the rhythmic contractile activity of the heart,it is referred to as the natural pacemaker of the human heart.

Sino-atrial node is called the pacemaker of our heart. Why?

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