The difference between sino-atrial node (SAN) and atrio-ventricular node (AVN) is:

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SAN is present in the upper left corner of the right atrium whereas AVN is present in the lower right corner of the right atrium

AVN acts as the pacemaker whereas SAN acts as a relay station

SAN can generate a greater number of action potentials per minute than AVN

SAN is auto-excitable whereas AVN is not auto-excitable

answer is C.

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Detailed Solution

Both SAN and AVN the ability to generate action potentials without any external stimuli (autoexcitable). 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.SAN is present in the upper right corner of the right atrium whereas AVN is present in the lower left corner of the right atrium. SAN acts as the pacemaker whereas AVN acts as a relay station.

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