Solved UPSC CDS/OTA Question
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Q · Respiratory System medium · 45s
The driving force for oxygen diffusion from alveoli to blood is the difference in:
TopicRespiratory System
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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Diffusion of O₂ occurs down its partial pressure gradient from ~105 mmHg in alveolar air to ~40 mmHg in pulmonary capillary blood, enabling oxygen uptake.
Final Answer: Option A - Partial pressure of oxygen (PO₂)