Multiple choice

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 replace the function of

  1. purkinje system

  2. sinoatrial node

  3. atrioventricular node

  4. atrioventricular bundle

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The sinoatrial (SA) node acts as the natural pacemaker of the heart, initiating the electrical impulse. An artificial pacemaker is implanted to replace this function when the SA node fails.