What are the two main branches of the right coronary artery?

The correct answer is identified as the right marginal artery and the posterior descending artery, which are indeed the two primary branches of the right coronary artery. The right coronary artery arises from the aorta and supplies blood to the right side of the heart, particularly the right atrium and right ventricle.

The right marginal artery branches from the right coronary artery and runs along the margin of the right ventricle, supplying blood to this portion of the heart. The posterior descending artery, also known as the posterior interventricular artery, typically travels in the posterior part of the interventricular sulcus and supplies blood to the inferior wall of both the right and left ventricles, as well as the interventricular septum.

Understanding these branches is crucial for recognizing their roles in coronary circulation and the potential impact of coronary artery disease on heart function. The other options listed involve vessels that do not branch from the right coronary artery, which distinguishes this choice as the correct answer.