Which coronary artery supplies the left ventricle?

The left circumflex artery plays a significant role in supplying blood to the left ventricle, particularly the lateral and posterior aspects. Anatomically, it branches off from the left main coronary artery, which further bifurcates into the left anterior descending artery and the left circumflex artery. While the left anterior descending artery primarily supplies the anterior wall of the left ventricle and interventricular septum, the left circumflex artery provides oxygenated blood to the left ventricle’s lateral and posterior walls.

The other options do not fulfill this specific role. The right coronary artery primarily supplies the right ventricle and parts of the inferior wall of the left ventricle in individuals with right dominant coronary circulation. The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs, not supplying any part of the heart muscle itself. Thus, the left circumflex artery is definitively identified as the artery responsible for providing blood supply to significant portions of the left ventricle, validating the choice made.