The sinoatrial node is located in the _ wall of the right atrium.
Correct answer: B. Upper dorsal
- A. Lower dorsal
- B. Upper dorsal
- C. On the interatrial septum
- D. Near the coronary sinus
Explanation
The sinoatrial (SA) node, also known as the natural pacemaker, is located in the upper dorsal (posterior) wall of the right atrium, near the junction of the superior vena cava and the right atrium. It is a small group of specialized cardiac cells that generate electrical impulses, controlling the heart's rhythm and rate.
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