Q. The option depicting the correct partial pressures (in mm Hg) is:

in alveolar air in deoxygenated blood in oxygenated blood in tissues
A 104 40 94 45
B 94 45 104 40
C 104 40 64 40
D 104 45 94 45

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Solution:

Partial pressure which is the pressure contributed by a single gas alone in the mixture of gases. It is represented as pG, where G represents different gases. The table gives us the pressures of oxygen and carbon-di-oxide during the exchange of gases from alveoli to blood and blood to the tissues. Carbon-di-oxide has a higher solubility in the blood times than that of oxygen due to which the partial pressure of is lower as compared to oxygen.