Question

Post caval opening in right auricle is guarded by

• A. Atrio-ventricular valve
• B. Tricuspid valve
• C. Bicuspid valve
• D. Eustachian valve

Answer 1

The correct option is D Eustachian valve

All the openings in right atrium are guarded by valves to prevent back flow of blood. In man, the right auricle receive blood from a precaval (superior vena cava) and a postcaval (inferior vena cava). The opening of postcaval into atrium is guarded by the Eustachian valves.

So, the correct answer is option D.