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

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

Answer: (D)

The main idea here is tracing blood after it gets oxygen in the lungs and understanding which vessels return that oxygenated blood to the heart. Oxygenated blood from the lungs travels back to the heart through the pulmonary veins, entering the left atrium (and then moving to the left ventricle to be pumped out to the body). This makes pulmonary veins the vessels that carry oxygenated blood from the lungs to the heart. By contrast, pulmonary arteries carry blood from the heart to the lungs and are deoxygenated when they reach the lungs, the aorta distributes oxygenated blood to the entire body, and the superior vena cava brings deoxygenated blood from the upper body to the right atrium.