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The pulmonary veins carry relatively oxygenated blood from the lungs to the heart. The superior and inferior venae cavae carry relatively deoxygenated blood from the upper and lower systemic circulations, respectively. The portal venous system is a series of veins or venules that directly connect two capillary beds.n contrast to veins, arteries carry blood away from the heart. Veins are less muscular than arteries and are often closer to the skin. There are valves in most veins to prevent backflow.
So as you go down along the artery it gets smaller and carries less and less blood as it branches. The major veins in the body carry de-oxygenated blood back from the circulation towards the right side of the heart. The pulmonary veins are the exception as they carry oxygenated blood from the lungs to the left heart. They join together to form larger and larger veins as they gather from the periphery toward the larger veins.