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Comparison of blood vessels

Below is a table illustrating the differences in structure and function between arteries, veins and capillaries.

Features Artery Capillary Vein
Walls Thick, muscular and elastic One cell thick Thin layer of muscle
Lumen Relatively small Very small (blood cells travel in single-file) Relatively large
Valves No No Yes
Pressure High Medium Low
Blood content Oxygenated Both Deoxygenated
Direction Away from heart Within tissue Towards heart
Arteries branch into capillaries, which combine to form veins.
Arteries branch into capillaries, which combine to form veins.