Three types of blood vessels in human circulatory system are: Arteries, Veins and Capillaries. Their functions are tabulated below:
| Arteries |
Veins |
Capillaries |
| (i) Arteries carry oxygenated blood from heart to various organs of the body. |
(i)Veins carry deoxygenated blood from various organs to heart. |
(i) Exchanges of materials between blood and surrounding cells take place in the capillaries. |
| (ii) They are thick walled. |
(ii) They are thin walled. |
(ii)They are thin walled and extremely narrow tubes or blood vessels which connect arteries to veins. |
