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Impulse of heart beat originates from:

1. S. A. node
2. A. V. node
3. Vagus nerve
4. Cardiac nerve

Correct answer: S. A. node

Solution

The sinoatrial (SA) node is the heart’s primary pacemaker, so it initiates the electrical impulse for each heartbeat. The AV node mainly delays and relays the signal, while nerves only modulate heart rate.

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