Before draining into the right atrium, where do the large veins of the coronary circulation gather together?
a. Coronary sinus
b. Left posterior coronary vein
c. Right coronary sulcus
d. Thebesian veins
ANS: A
These veins gather together into a large vessel called the coronary sinus, which passes left to right across the posterior surface of the heart. The coronary sinus empties into the right atrium.
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