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Difference between artery and vein inclu...

Difference between artery and vein includes all, except

A

Diameter of vessel

B

Valves

C

Elasticity of vessel wall, smooth muscles in tunica media

D

Type of cells in endothelium

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The correct Answer is:
To answer the question regarding the differences between arteries and veins, we need to analyze the characteristics of both types of blood vessels and identify which option does not represent a difference. ### Step-by-Step Solution: 1. **Understanding the Diameter of Vessels**: - Arteries have a smaller diameter compared to veins. This is because arteries carry oxygenated blood under high pressure, while veins carry deoxygenated blood at lower pressure. - **Conclusion**: The diameter of veins is larger than that of arteries. 2. **Presence of Valves**: - Veins contain valves that prevent the backflow of blood, ensuring that it moves in one direction towards the heart. - In contrast, arteries do not have valves because the high pressure of the blood flow keeps it moving forward. - **Conclusion**: Valves are present in veins but absent in arteries. 3. **Elasticity of Vessel Walls**: - The walls of arteries are more elastic than those of veins. This elasticity allows arteries to withstand and regulate the high pressure of blood pumped from the heart. - Veins have thinner walls and less elasticity since they operate under lower pressure. - **Conclusion**: Arteries have more elastic walls compared to veins. 4. **Type of Cells in Endothelium**: - Both arteries and veins have endothelial cells lining their inner walls, but the structure of these cells can differ due to the varying functions and pressures in arteries and veins. - The presence of elastic fibers is more prominent in arteries than in veins. - **Conclusion**: There are differences in the types of cells and their arrangement in arteries and veins. ### Final Answer: The difference between artery and vein includes all, except the presence of valves. Valves are present in veins but not in arteries.
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