Which vessel transports oxygenated blood from the lungs to the left atrium?

Which vessel transports oxygenated blood from the lungs to the left atrium?

• A. Pulmonary veins.
• B. Pulmonary arteries.
• C. Aorta.
• D. Superior vena cava.

Answer: (A)

Oxygenated blood returning from the lungs to the heart travels through the pulmonary veins into the left atrium. After gas exchange, the blood in the lungs is rich in oxygen, and the pulmonary veins are the vessels that carry this oxygen-rich blood back to the heart's left-side chamber so it can move on to the left ventricle and then to the systemic circulation. The other vessels have different roles: pulmonary arteries carry deoxygenated blood from the right heart to the lungs; the aorta distributes oxygenated blood from the left ventricle to the body; the superior vena cava brings deoxygenated blood from the upper body to the right atrium.

Oxygenated blood returning from the lungs to the heart travels through the pulmonary veins into the left atrium. After gas exchange, the blood in the lungs is rich in oxygen, and the pulmonary veins are the vessels that carry this oxygen-rich blood back to the heart's left-side chamber so it can move on to the left ventricle and then to the systemic circulation. The other vessels have different roles: pulmonary arteries carry deoxygenated blood from the right heart to the lungs; the aorta distributes oxygenated blood from the left ventricle to the body; the superior vena cava brings deoxygenated blood from the upper body to the right atrium.