During heart surgery, a surgeon fixes a valve that stops blood from flowing backward into the right ventricle. Based on the given situation, the valve that was repaired is:
Correct answer: D. Pulmonary semilunar valve
- A. Mitral valve
- B. Aortic semilunar valve
- C. Tricuspid valve
- D. Pulmonary semilunar valve
Explanation
Blood leaves the right ventricle through the pulmonary trunk, and the pulmonary semilunar valve closes to stop it flowing back into the right ventricle. The tricuspid valve is the tempting answer because it also guards the right ventricle, but it stops backflow from the ventricle into the right atrium, not into the ventricle.
This question appeared on the UHS MDCAT 2026 paper, which you can sit online with every answer explained.
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The human heart is a four chambered muscular pump that maintains double circulation through the pulmonary and systemic circuits. Questions cover atria, ventricles, valves, major blood vessels, the cardiac cycle, pressure changes, the conduction system and ECG, while distinguishing arteries and veins from the chambers that receive or eject blood.
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