Arteries | Veins |
They carry oxygenated blood except pulmonary artery. | They carry deoxygenated blood except pulmonary veins. |
They carry blood away from the heart to different body organs. | They carry blood towards the heart from the different body organs. |
They have a thick wall and narrow lumen and they lack valves. | They have a thin wall and broad lumen and they have valves. |