Which vessels carry oxygenated blood from the lungs to the left atrium of the heart?

• A. Pulmonary Veins
• B. Pulmonary Artery
• C. Capillaries
• D. Aorta

Answer: (A)

In this part of circulation, blood is oxygenated in the lungs and then returns to the heart to be pumped to the body. The vessels that carry this newly oxygenated blood from the lungs back to the heart are the pulmonary veins. They deliver this blood into the left atrium, which then passes it to the left ventricle and onward to the body.

Understanding the paths helps: the pulmonary artery carries blood from the heart to the lungs and is typically deoxygenated. The capillaries in the lungs are where gas exchange happens, turning blood from deoxygenated to oxygenated. The aorta distributes oxygenated blood from the left ventricle to the body, not back to the heart. So the channel that transports oxygenated blood from the lungs to the left atrium is the pulmonary veins.