Which of the following acts as the natural pacemaker of the human heart?

Science & Technology ·Previously asked in JKPSC Combined Competitive Examination (JKCCE) 2025

View the full solved paper: GS Paper I (Set B)

Question

Which of the following acts as the natural pacemaker of the human heart?

  1. A. AV node
  2. B. SA node (Correct answer)
  3. C. Bundle of His
  4. D. Purkinje fibers

Correct Answer

Option B — SA node

Detailed Solution & Explanation

The correct answer is SA node.

Key Points

  • The SA node (Sinoatrial node), located in the right atrium, initiates the electrical impulse that triggers each heartbeat.
  • It is the natural pacemaker of the heart.
  • The AV node (atrioventricular node) acts as a secondary/backup pacemaker.
  • The Bundle of His and Purkinje fibers conduct the impulse to the ventricles.