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

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

(1) pO2 = 159 and pCO2 = 0.3

(2) pO2 = 104 and pCO2 = 40

(3) pO2 = 40 and pCO2 = 45

(4) pO2 = 95 and pCO2 = 40

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(2) pO2 = 104 and pCO2 = 40

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