First slide

Exchange of Gases

Question

The rate of diffusion of gases through the respiratory membrane increases with an increase in
A. surface area
B. solubility of gases
C. partial pressure difference
D. membrane thickness
E. molecular weight of the gases

Easy

A

A, B and C
B

B, C and D
C

A, B and D
D

A, B and E

Solution

The rate of diffusion of gases through the respiratory membrane increases with an increase in surface area, solubility of gases and partial pressure difference. It decreases with an increase in diffusion distance and the molecular weight of the gases.

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