Arteries | Veins |
They are thick-walled. | They are thin-walled. |
Arteries lie deep under the skin. | Veins are superficial and lie just beneath the skin. |
Arteries do not have valves. | Veins have valves. |
All arteries, except the pulmonary artery, carry oxygenated blood. | All veins, except the pulmonary vein, carry deoxygenated blood. |