Comparison of blood vessels
Below is a table illustrating the differences in structure and function between arteries, veins and capillaries.
|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|
|Direction||Away from heart||Within tissue||Towards heart|
Arteries branch into capillaries, which combine to form veins.