Question

Pacemaker (SA Node) of the heart is situated

• A. In wall of right atrium close to eustachian valve
• B. On intra - auricular septum
• C. On inter - venticular septum
• D. In wall of left atrium close to the opening of pulmonary veins

Answer 1

Answer: (A)

In wall of right atrium close to eustachian valve

Pacemaker serves to produce rhythmic impulses for the heart beat. 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 superior vena cava. Thus, the correct answer is option A.