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Q. Most suitable reason why SA node act as pacemaker for heart.

NTA AbhyasNTA Abhyas 2020Body Fluids and Circulation

Solution:

Sino-atrial node (SAN) - SAN is a patch of nodal tissue present in the right upper corner of the right atrium.
It can generate the maximum number of action potentials : 70 - 75 / min. It is also termed as the pacemaker because it is responsible for initiating and maintaining the rhythmic contractile activity of the heart. Normal heart rate = 70-75 times in a minute (72 beats/min).