Anatomy And Physiology II (APII) Exam 3 Practice Test

Oxygen-rich blood from the lungs enters the heart via which vessels?

Aorta Pulmonary veins Superior vena cava Pulmonary arteries

Correct Answer:

Pulmonary veins

Explanation:

Oxygen-rich blood from the lungs returns to the heart through the pulmonary veins, delivering it to the left atrium. This vessel set is unique because, in the pulmonary circuit, veins carry oxygenated blood back to the heart, unlike most systemic veins. From the left atrium, blood moves to the left ventricle and then into the aorta to nourish the body. In contrast, the aorta carries oxygenated blood away from the heart to the body, the superior vena cava brings deoxygenated blood from the upper body to the right atrium, and the pulmonary arteries carry deoxygenated blood from the right ventricle to the lungs.

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