Which is the largest artery in the body?

• A. Artery
• B. Vena Cava
• C. Aorta
• D. Capillary

Answer: (C)

The largest artery in the body is the aorta. It carries oxygenated blood from the left ventricle into the systemic circulation and has the greatest diameter among arteries to handle the high-volume, high-pressure flow after each heartbeat. Blood enters the ascending aorta, moves through the aortic arch, and travels down the thoracic and abdominal portions to supply all tissues. Its thick, elastic walls help absorb the pressure pulse and then recoil to smooth the flow, a mechanism known as the Windkessel effect. The other options don’t fit: the vena cava is a vein returning blood to the heart; capillaries are the tiny vessels where exchange occurs; and while arteries carry blood away from the heart, the aorta is the largest among them.