The left coronary artery primarily supplies blood to which tissue?

• A. Brain
• B. Heart muscle
• C. Lungs
• D. Abdominal organs

Answer: (B)

The main concept is that coronary arteries feed the myocardium, the heart muscle, which has a high oxygen demand. The left coronary artery branches into vessels like the left anterior descending and circumflex arteries that nourish the left ventricle, parts of the left atrium, and the interventricular septum. Because of this focus on nourishing the heart muscle, the left coronary artery is primarily associated with supplying tissue that makes up the heart itself. The brain gets its blood from cerebral arteries, the lungs from the pulmonary circulation, and abdominal organs from the abdominal aorta’s branches, not from the left coronary artery.