The pulmonary veins carry blood from the lungs to the left atrium of the heart. They are the only veins in the adult human body that carry oxygenated blood.

Cardiovascular system

Heart - Aorta - Arteries - Arterioles - Capillaries - Venules - Veins - Venae cavae - Pulmonary arteries - Lungs - Pulmonary veins - Blood