Question

Pace-maker in heart is situated

• A. In the wall of left atrium
• B. In the wall of right atrium
• C. On inter-venticular septum
• D. On inter-auricular septum

Answer 1

Answer: (B)

In the wall of right atrium

The sinoatrial node or SA node is the pacemaker of the heart and is responsible for the initiation of the heartbeat. It spontaneously generates an electrical impulse, which after conducting throughout the heart, causes the heart to contract. The sinoatrial node is located in the right atrium of the heart.
Therefore, the correct answer is option B.