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Question
State the differences between artery, vein and capillary.
Solution
Differences between artery, vein, and capillary:
| Arteries | Veins | Capillaries |
| Arteries are tough, thick, and elastic tubes. | Veins are thin-walled and non-elastic tubes. | Capillaries are very thin-walled tubes. |
| They have a narrow lumen. | They have a wide lumen. | They have a very narrow lumen, just wide enough for a red blood cell to pass through it. |
| They carry blood away from the heart to the various organs of the body, at high pressure. | They transport blood towards the heart from various organs, at low pressure. | They carry blood from the arteries to the veins. |
| They do not have valves. | They have valves to prevent the backward flow of the blood. | They do not have valves. |
| They transport only oxygenated blood (except for the pulmonary artery). | They transport only deoxygenated blood (except for the pulmonary vein). | They exchange oxygen, carbon dioxide, water, and salts between the blood and the surrounding tissues |
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