NEETBiologyBreathing and Exchange of GasesMCQ+4 / −1
The partial pressures (in mm Hg) of oxygen (O2) and carbon dioxide (CO2) at alveoli (the site of diffusion) are :
- ApO2 = 159 and pCO2 = 0.3
- BpO2 = 104 and pCO2 = 40
- CpO2 = 40 and pCO2 = 45
- DpO2 = 95 and pCO2 = 40
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Correct answer: B
Option (b) is correct because pO2 in alveoli is 104 mm Hg and pCO2 in alveoli is 40 mmHg.
In atmosphere, pO2 is 159 mm Hg and pCO2 is 0.3 mm Hg.
In deoxygenated blood, pO2 is 40 mmHg and pCO2 is 45 mmHg.
In oxygenated blood, pO2 is 95 mmHg and pCO2 is 40 mmHg.
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