Which artery branches off the right coronary artery and supplies the right ventricle?

• A. Posterior interventricular artery
• B. Anterior interventricular artery
• C. Left coronary artery
• D. Marginal artery

Answer: (D)

The key idea is how the right coronary artery feeds the right ventricle through its branches. The marginal artery branches directly from the right coronary artery and runs along the acute margin of the right ventricle, delivering blood to the right ventricular muscle. While another branch from the right coronary artery, the posterior interventricular artery, can also supply the posterior aspects of both ventricles, the branch most specifically associated with the right ventricle itself is the marginal artery. The anterior interventricular artery arises from the left coronary artery (the LAD), not from the right coronary, and the left coronary artery is a separate vessel, not a branch of the right coronary.