The pulmonary veins are the veins that carries oxygenated blood from the lungs to the heart. They are the only veins in the body that carries oxygenated blood; they also differ from the other veins in that they do not have valves.

There are four pulmonary veins: the left and right superior and inferior veins. These enter the heart via the left atrium.

Pulmonary vein at Wikipedia

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