The given statement that the coronary sinus is a modified vein that collects venous blood from all areas of the heart and drains it directly into the left atrium of the heart is true
On the backside of the left atrium, within the left atrioventricular groove, is the coronary sinus, a sizable venous structure. The coronary sinus is responsible for removing venous blood from the bulk of the heart. Between the right atrioventricular orifice, the fossa ovalis, and the inferior vena cava aperture, it enters the right atrium. A thin, semicircular endocardial fold, also known as the Thebesian valve, frequently protects the coronary sinus.
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