Zoology - Body Fluids and Circulation Question with Solution | TestHub

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).