Question

blood exits the left side of the heart into the:
a aorta.
b vena cavae.
c pulmonary vein.
d pulmonary artery.

Explanation:

The left - ventricle of the heart pumps oxygen - rich blood into the aorta, which distributes it to the rest of the body. The vena cavae bring deoxygenated blood to the heart, the pulmonary veins bring oxygenated blood from the lungs to the heart, and the pulmonary artery takes deoxygenated blood from the right - side of the heart to the lungs.

Answer:

A. aorta