From which vessel do the coronary arteries originate?

From which vessel do the coronary arteries originate?

• A. Pulmonary artery.
• B. Superior vena cava.
• C. Aorta.
• D. Inferior vena cava.

Answer: (C)

The coronary arteries originate from the aorta. Specifically, they rise from the aortic sinuses just above the aortic valve in the ascending aorta, so they receive oxygenated blood directly from the aorta as it leaves the heart. Blood flows into these arteries mainly during diastole, when the aortic valve is closed and high aortic pressure can perfuse the myocardium. The other vessels listed have different roles: the pulmonary artery carries blood to the lungs, while the superior and inferior vena cavae return venous blood to the right side of the heart.

The coronary arteries originate from the aorta. Specifically, they rise from the aortic sinuses just above the aortic valve in the ascending aorta, so they receive oxygenated blood directly from the aorta as it leaves the heart. Blood flows into these arteries mainly during diastole, when the aortic valve is closed and high aortic pressure can perfuse the myocardium. The other vessels listed have different roles: the pulmonary artery carries blood to the lungs, while the superior and inferior vena cavae return venous blood to the right side of the heart.