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 gas diffuses into blood at systemic capillaries?
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.
CO₂ produced by cellular metabolism diffuses down its partial pressure gradient from tissues into venous blood. It is transported as bicarbonate, bound to hemoglobin, or dissolved plasma, and expelled in pulmonary capillaries.
Final Answer: Option B - Carbon dioxide