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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.
The largest artery from the heart is called the aorta. This artery branches into smaller and smaller vessels before finally reaching the tiny capillaries where oxygen and nutrients are delivered to organs and tissues. The other main artery from the heart goes to the lungs where its blood picks up oxygen.Veins are the blood vessels that carry blood back to the heart. They have much thinner walls than arteries and are under less pressure.he other main artery from the heart goes to the lungs where its blood picks up oxygen. Veins are the blood vessels that carry blood back to the heart. They have much thinner walls than arteries and are under less pressure.