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 :

1. A. The sino-atrial node has a lower inherent rate of depolarisation
2. B. All the other components in heart cannot conduct the action potential
3. C. Only the sino-atrial node is auto-excitable and auto-rhythmic
4. D. The sino-atrial node has a higher inherent rate of depolarisation

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