Solved UPSC CDS/OTA Question
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Q · Respiratory System medium · 45s
What factor does NOT significantly affect diffusion rate across alveolar membrane?
TopicRespiratory System
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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Diffusion rate is determined by Fick’s law: proportional to surface area and diffusion coefficient (solubility/√molecular weight), inversely to membrane thickness. Bronchial diameter affects airflow, not diffusion rate.
Final Answer: Option D - Bronchial diameter