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प्रश्न
Differentiate between the types of blood vessels.
अंतर स्पष्ट करें
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उत्तर
| Basis of Difference | Artery | Vein | Capillary |
|---|---|---|---|
| Direction | It carries blood away from the heart. | It carries blood towards the heart. | It connects arterioles to venules. |
| Wall | The wall is thick and elastic. | The wall is thin and less elastic. | The wall is only one-cell thick. |
| Lumen | It has a narrow lumen. | It has a wide lumen. | It has an extremely narrow lumen. |
| Valves | Valves are completely absent. | Valves are present to prevent backflow. | Valves are completely absent. |
| Pressure | Blood flows under high pressure. | Blood flows under low pressure. | Blood flows under very low pressure. |
| Function | It distributes blood to the tissues. | It collects blood from the tissues. | It exchanges gases and nutrients with tissues. |
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