A) Mitral valve
B) Eustachian valve
C) Thebesian valve
D) Tricaspid valve
Correct Answer: C
Solution :
The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the heart muscle (myocardium). It delivers deoxygenated blood to the right atrium, as do the superior and inferior vena cava. It returns the blood from the substance of the heart, and is protected by a semicircular fold of the lining membrane of the right atrium, at the orifice of the coronary sinus known as thebesian valve {i.e., valve of coronary sinus). Its main function is to prevent the regurgitation of blood into the sinus during the contraction of the atrium.
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