Which vessel carries oxygenated blood from the lungs to the heart?

• A. Pulmonary Veins
• B. Pulmonary Arteries
• C. Aorta
• D. Vena Cava

Answer: (A)

Oxygenated blood is returned to the heart from the lungs through the pulmonary veins. After blood is oxygenated in the lungs, it travels back to the heart via these veins and enters the left atrium, ready to be pumped to the rest of the body. This reflects how the pulmonary circuit carries blood to the lungs for gas exchange and back to the heart, while the systemic circuit carries blood from the heart to the body.

In the same idea: the pulmonary arteries carry blood from the heart to the lungs (mostly deoxygenated), the aorta distributes oxygenated blood to the body, and the vena cava brings deoxygenated blood from the body back to the heart.