Solved UPSC CDS/OTA Question
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Q · Circulatory Systemmedium · 45s
Which blood vessel has the thinnest wall?
TopicCirculatory System
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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Capillaries consist of a single endothelial cell layer with no tunica media or externa, facilitating rapid diffusion of gases and nutrients. Their thin walls and narrow lumen support efficient exchange despite low pressure.
Final Answer: Option C - Capillary