Multiple choice general knowledge science & technology

Which of the following is also referred to as the pacemaker of the heart?

  1. Atrioventricular node

  2. Sinoatrial node

  3. Purkinje fibers

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The sinoatrial (SA) node, located in the right atrium near the superior vena cava, is the heart's natural pacemaker. It spontaneously generates electrical impulses (~60-100 bpm) that initiate each heartbeat. The AV node delays impulses, and Purkinje fibers conduct signals to ventricles.

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