Question

blood is returned to the right side of the heart by the:
a aorta.
b vena cavae.
c pulmonary vein.
d pulmonary artery.

Explanation:

The vena cavae are the large veins that carry de - oxygenated blood from the body back to the right atrium of the heart. The aorta carries oxygenated blood from the left ventricle to the body. The pulmonary veins carry oxygenated blood from the lungs to the left atrium. The pulmonary artery carries de - oxygenated blood from the right ventricle to the lungs.

Answer:

B. vena cavae