Partial pressures of oxygen and carbon dioxide in healthy human lung alveoli are respectively, nearest to.

100 and 40 mm of Hg

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90 and 20 mm of Hg

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40 and 46 mm of Hg

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159 and 3.3 mm of Hg

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Solution

The correct option is A 100 and 40 mm of Hg
Partial pressure is the individual pressure exerted independently by a particular gas within a mixture of gasses. The air we breath is a mixture of gasses i.e, nitrogen, oxygen, & carbon dioxide. The partial pressure of O $_{2}$ and CO $_{2}$ in the body (normal, resting conditions) is pO $_{2}$ = 100mm of Hg and CO $_{2}$ = 40mm of Hg. So, the correct answer is option A.

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Respiratory gas	Atmospheric air	Alveoli
$O_{2}$	159	A
$C O_{2}$	0.3	B

The table given shows the partial pressure values (in mm Hg) of oxygen and carbon dioxide in the alveoli in comparison to that in atmospheric air. Identify A and B and choose the correct option accordingly.

If the partial pressures of oxygen and carbon dioxide in the alveoli are 104 and 40 and in the blood reaching the alveoli at that moment it is 40 and 45 respectively, then oxygen and carbon dioxide will diffuse from

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