CVS Practice Test

The artery that supplies the posterior fascicle of the left bundle branch is the right coronary artery. This is because the right coronary artery typically gives rise to branches that supply areas of the heart that are innervated by the right and the posterior aspects of the cardiac conduction system, including parts of the left bundle branch.

The posterior fascicle specifically is crucial for conducting electrical impulses to the left ventricle's posterior wall, and its supply comes predominantly from the right coronary artery. While the left coronary artery and its branches, such as the circumflex artery, serve the anterior and lateral walls of the heart, they do not primarily supply the posterior fascicle. The aorta is the main vessel providing systemic circulation but does not supply specific bundles in the conduction system of the heart. Therefore, understanding the anatomical and physiological relationships offers insight into why the right coronary artery is the correct answer for the supply of the posterior fascicle.