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Veins have much thinner walls, because the blood they carry is under low pressure. VEINS have valves that aid the return of blood to the heart and prevent blood from going backwards. ARTERIES do not have valves, except for the semi-lunar valves of the pulmonary artery and the aorta. ARTERIES have relatively narrow lumens, VEINS have relatively wide lumens.
Veins are blood vessels carrying blood towards the heart, whereas arteries bring blood away from heart. Mostly, arteries contain oxygenated blood, and veins contain carbon d â¦ ioxide-rich and oxygen-poor blood; however, there is one exception.hen the arteries deposit the oxygen and other nutrients through the capillaries, the blood then moves to the veins, which will carry the blood back to the heart. The veins are made from all the capillary branches moving back to gether.