Question

The factor which does not affect the rate of alveolar diffusion is

• A. solubility of gases
• B. thickness of the membranes
• C. pressure gradient
• D. reactivity of the gases

Answer 1

Answer: (D)

reactivity of the gases

Answer 2

$O_2$ and $CO_2$ are exchanged in the alveoli by simple diffusion. The factors that affect the diffusion are pressure gradient of the gases, solubility of the gases and the thickness of the membranes involved in diffusion.