Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ - decoded step-by-step.
Solve it the standard way once - then learn the shortcut.
Q · Circulatory Systemmedium · 45s
Which vessels are the site of nutrient and gas exchange?
TopicCirculatory System
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained - no skipped algebra.
Capillaries, the smallest blood vessels with thin endothelial walls, allow diffusion of O₂, CO₂, nutrients, and waste between blood and interstitial fluid. Their extensive network slows blood flow, maximizing exchange efficiency.
Final Answer: Option C - Capillaries