Which artery is primarily responsible for perfusing the heart muscle with blood?

Which artery is primarily responsible for perfusing the heart muscle with blood?

• A. Pulmonary artery
• B. Left coronary artery
• C. Pulmonary vein
• D. Renal artery

Answer: (B)

Blood to the heart muscle is supplied by the coronary arteries that originate from the aorta. The left coronary artery is the primary supplier because it branches into the left anterior descending and left circumflex arteries, which perfuse most of the left ventricle and the interventricular septum—the areas responsible for the heart’s main pumping action. The right coronary artery also feeds portions of the myocardium, but the left coronary circulation covers the majority of the heart muscle. Coronary blood flow mainly occurs during diastole when the heart is relaxed, allowing the vessels to fill. The pulmonary artery, pulmonary vein, and renal artery are not involved in nourishing the heart muscle.

Blood to the heart muscle is supplied by the coronary arteries that originate from the aorta. The left coronary artery is the primary supplier because it branches into the left anterior descending and left circumflex arteries, which perfuse most of the left ventricle and the interventricular septum—the areas responsible for the heart’s main pumping action. The right coronary artery also feeds portions of the myocardium, but the left coronary circulation covers the majority of the heart muscle. Coronary blood flow mainly occurs during diastole when the heart is relaxed, allowing the vessels to fill. The pulmonary artery, pulmonary vein, and renal artery are not involved in nourishing the heart muscle.