In humans,the heart rate of 72 beats/minute i | vedclass

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(A) The heart is myogenic,meaning its rhythmic contraction is initiated by a specialized nodal tissue. The $SA$ (Sinoatrial) node is known as the pace

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$SA$ node

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(A) The heart is myogenic,meaning its rhythmic contraction is initiated by a specialized nodal tissue. The $SA$ (Sinoatrial) node is known as the pacemaker of the heart because it generates the maximum number of action potentials ($70-75$ per minute) and is responsible for initiating and maintaining the rhythmic contractile activity of the heart at a rate of approximately $72$ beats per minute.

In humans,the heart rate of $72$ beats/minute is regulated by which of the following?

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