Verified Answer :

valves:  veins have valves arteries do not have...
lumen: in arteries it is small while in veins it is large...
walls: in arteries walls are thick ..in veins walls are thin...
blood: veins have deoxygenated blood (except pulmonary vein) .. while arteries have oxygenated blood...(except pulmonary artery)...

tadvisohil886

.The most important difference between veins and arteries is that veins carry oxygenated blood while arteries carry oxygenated blood.Veins have valves and have thin walls.

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