All the components of the conducting system can generate an action potential for the contraction of heart muscle, but the sino-atrial node acts as the pacemaker because; (2017-Gujarat)
- Asino-atrial node has a lower inherent rate of depolarisation.
- Ball the other components in heart cannot conduct the action potential.
- Conly the sino-atrial node is auto-excitable and auto- rhythmic.
- Dsino-atrial node has a higher inherent rate of depolarisation.
✓ Correct answer: D
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