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प्रश्न
Differentiate between an artery and a vein with reference to lumen and thickness of wall.
अंतर स्पष्ट करें
उत्तर
| Artery | Vein | |
| 1. | The lumen is narrow. | The lumen is wide. |
| 2. | It is thick-walled. | It is thin-walled. |
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