Ward: Respiratory System at a Glance

a is slower for carbon dioxide than for oxygen because its molecular weight is higher

b occurs at a rate which is proportional to the difference in concentration (mL gas per mL fluid) on either side of the membrane

c is unaffected by oedema fluid in the alveolus because it is only cells that act as a barrier to diffusion

d is slower for gases with low solubility in the membrane.

The Respiratory System