Sino-atrial node is present in the
Sino-atrial node (SAN) is a patch of nodal tissue is present in the right upper corner of the right atrium
Atrio-ventricular node (AVN) is another mass of nodal tissue is seen in the lower left corner of the right atrium close to the atrio-ventricular septum.
The nodal musculature has the ability to generate action potentials without any external stimuli, i.e., it is autoexcitable. However, the number of action potentials that could be generated in a minute vary at different parts of the nodal system. The SAN can generate the maximum number of action potentials, i.e., 70-75 min–1, and is responsible for initiating and maintaining the rhythmic contractile activity of the heart. Therefore, it is called the pacemaker.
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