Question

The diffusion of ${CO}_2$ across the alveolar membrane is 20 times faster than that of $O_2$ because

• A. CO₂ is actively transferred.
• B. The alveolar area available for CO₂ diffusion is larger.
• C. CO₂ is non polar/lipid soluble than O₂, which enables it to pass the membrane more readily.
• D. The CO₂ pressure gradient is larger.

Answer 1

The correct option is C

CO₂ is non polar/lipid soluble than O₂, which enables it to pass the membrane more readily.

CO₂ is non polar so diffusion of CO₂ across the alveolar membrane/lipid membrane is faster than that of O_2.