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The pulmonary veins entering the Human heart

The pulmonary veins are a group of blood vessels which carry oxygenated blood directly to the heart. With the exception of the umbilical veins found in a fetus, they are the only veins in the body of most humanoid species which carry oxygen-rich blood to the heart. All other veins carry deoxygenated blood towards the heart, while it is the role of arteries to move oxygenated blood away from the heart.
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