The partial pressures (in mm Hg) of oxygen (O2) and carbon dioxide (CO2) at alveoli (the site of diffusion) are :

Question

The partial pressures (in mm Hg) of oxygen (O₂) and carbon dioxide (CO₂) at alveoli (the site of diffusion) are :

pO₂ = 159 and pCO₂ = 0.3

pO₂ = 104 and pCO₂ = 40

pO₂ = 40 and pCO₂ = 45

pO₂ = 95 and pCO₂ = 40

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