This article will help you to differentiate among artery, vein and capillary.
Difference # Artery:
1. Carry blood away from heart.
2. Outer coat is thin middle coat is thick.
3. Lumen is small.
4. Pure oxygenated blood is passed except pulmonary artery.
5. Semilunar valves are absent.
6. Press of blood is high.
7. Blood flow is rapid through artery.
Difference # Vein:
1. Carry blood towards the heart.
2. Outer coat is thick middle coat is thin.
3. Lumen is large in veins.
4. Impure deoxygenated blood passed except pulmonary vain.
5. Semilunar valves are present to prevent back flow of Blood.
6. Press of blood is low.
7. Blood flow is slow through veins.
Difference # Capillary:
1. Link-artery to Vein.
2. Outer and middle coats are absent.
3. Lumen is small in capillary.
4. First part of the capillary contains oxygenated blood and last part contains deoxygenated blood
5. Semilunar valves are absent.
6. Pressure is falling.
7. Blood flow is slow through capillary.