First slide

Exchange of Gases

Question

The amount of CO₂ that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher compared to that of O₂ because

Easy

A

the molecular weight of CO₂ is greater than that of O₂
B

CO₂ diffuses easily through gap junctions in the alveolar epithelium while O₂ has to diffuse through tight junctions
C

CO₂ is water-soluble whereas O₂ is lipid-soluble
D

the solubility of CO₂ is much higher compared to that of O₂

Solution

According to Herny's law, the amount of a gas that will dissolve in a liquid is proportional to the partial pressure of the gas and its solubility. As the solubility of CO₂ is 20-25 times higher than that of O₂, the amount of CO₂ that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher compared to that of O₂.

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