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The cardiac pacemaker in a patient fails to function normally. The doctors find that an artificial pacemaker is to be grafted in him. It is likely that it will be grafted at the site of:

1. Atrioventricular bundle
2. Purkinje system
3. Sinuatrial node
4. Atrioventricular node

Correct answer: Sinuatrial node

Solution

The sinoatrial (SA) node is the heart’s primary pacemaker, initiating the electrical impulse that controls normal heartbeat rhythm. If an artificial pacemaker is needed, it is typically placed to take over this role, so the SA node is the relevant site.

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