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Q.

Sino-atrial node (SAN) 

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a

maintains but does not initiate the rhythmic contractile activity of heart

b

generates the minimum number of action potentials

c

is a bundle of nodal fibres in the walls of ventricles

d

is present in the right upper corner of the right atrium

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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Sino-atrial node (SAN)