Sino-atrial node (SAN)

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is present in the right upper corner of the right atrium

generates the minimum number of action potentials

maintains but does not initiate the rhythmic contractile activity of heart

is a bundle of nodal fibres in the walls of ventricles

answer is A.

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Detailed Solution

Purkinje fibres are the nodal fibres in the walls of ventricles.A patch of this tissue is present in the right upper corner of the right atrium called the sino-atrial node (SAN). 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.

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