All the components of the conducting system can generate an…

Biology Body Fluids and Circulation All Topic Question For Revision Test Single Correct MCQ

Published on: August 14, 2026

All the components of the conducting system can generate an action potential for the contraction of heart muscle, but the SA node acts as the pace maker because -

All the other components of the heart cannot conduct the action potential

Only the SA node is autoexcitable and autorhythmic

The SA node has a higher inherent rate of depolarization

The SA node has a lower inherent rate of depolarization.

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