Which arteries supply the major portion of their respective ventricles?

• A. Left & Right coronary arteries
• B. Anterior descending and circumflex arteries
• C. Coronary sinus and great cardiac vein
• D. Inferior phrenic arteries

Answer: (A)

Ventricular blood supply comes from the coronary arteries, with each ventricle getting its major share from its respective artery: the left ventricle is mainly supplied by the left coronary artery through its branches (the anterior interventricular/LAD and the left circumflex), while the right ventricle is mainly supplied by the right coronary artery via its branches (right marginal and related branches) in most individuals. So, when asked which arteries supply the major portion of their respective ventricles, the answer points to the left and right coronary arteries as the overall source for the ventricles.

The other options aren’t correct because the anterior descending and circumflex arteries are branches of the left coronary artery and don’t alone supply the right ventricle, the coronary sinus and great cardiac vein are venous vessels (not arteries), and the inferior phrenic arteries supply the diaphragm rather than the ventricles.