NEET2021Zoology-Gas Exchange in Alveoli
NEET 2021 Zoology Partial Pressures of O₂ and CO₂ MCQ Question
Type: MCQ-numerical-Medium-Class 11
The partial pressures (in mm Hg) of oxygen (O₂) and carbon dioxide (CO₂) at alveoli (the site of diffusion) are :
A
pO₂ = 104 and pCO₂ = 40
B
pO₂ = 40 and pCO₂ = 45
C
pO₂ = 95 and pCO₂ = 40
D
pO₂ = 159 and pCO₂ = 0.3
Correct Answer
Option A
Detailed Explanation
In the alveoli, the partial pressure of oxygen is approximately 104 mm Hg and that of carbon dioxide is about 40 mm Hg, facilitating gas exchange.
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