Question

In a man, artificial pacemaker is implanted due to defects in:

• A. SA node
• B. SV node
• C. Mitral valve
• D. Purkinje fibres

Answer 1

The correct option is A SA node

• Pacemaker serves to produce rhythmic impulses for the heartbeat.
• The sinoatrial node (SA) node serves as a pacemaker and is a small mass of specialized cardiac muscle. It is present in the posterior wall of the right atrium near the opening of the superior vena cava.
• When the natural pacemaker is defective, the heartbeat may be too fast, too slow or irregular.
• Artificial pacemakers are electronic devices that stimulate the heart with electrical impulses to maintain or restore a normal rhythm in people with irregular heart rhythms.
• An artificial pacemaker provides an electrical impulse (discharge) that can stimulate the heart, thus restoring or maintaining a regular heartbeat.

So, the correct answer is option A.