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Q.

Which of the following is common for SAN, AVN and Purkinje fibres?

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a

All are made up of sympathetic nerve fibres.

b

All can generate action potentials without any external stimuli.

c

All can generate 70-75 action potentials per minute.

d

All of these acts as natural pacemakers in the heart.

answer is A.

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Detailed Solution

SAN, AVN and Purkinje fibres form a  network of specialized cardiac muscle fibers called autorhythmic fibres. They are self-excitable. Autorhythmic fibers repeatedly generate action potentials that trigger heart contractions. During embryonic development, only about 1% of the cardiac muscle fibers become autorhythmic fibres.

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