The Thebesian valve is located at the ostium of which vessel?

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Multiple Choice

The Thebesian valve is located at the ostium of which vessel?

Explanation:
The main idea is that the Thebesian valve is a small flap guarding the opening where the coronary sinus empties into the right atrium. The coronary sinus collects blood from the heart’s veins and delivers it into the right atrium, so the ostium—its entry into the atrium—is what the valve sits at. The valve helps limit backflow from the right atrium into the coronary sinus during atrial contraction. It is not located at the openings of the inferior or superior vena cava or at the pulmonary artery. Therefore, the ostium in question is the coronary sinus.

The main idea is that the Thebesian valve is a small flap guarding the opening where the coronary sinus empties into the right atrium. The coronary sinus collects blood from the heart’s veins and delivers it into the right atrium, so the ostium—its entry into the atrium—is what the valve sits at. The valve helps limit backflow from the right atrium into the coronary sinus during atrial contraction. It is not located at the openings of the inferior or superior vena cava or at the pulmonary artery. Therefore, the ostium in question is the coronary sinus.

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