CO2 diffuses more easily through the respiratory membrane than O2 because it is
Diffusion of Gases Through Liquids The more soluble a gas is, the faster it will diffuse. In this case carbon dioxide diffuses much faster than oxygen, as it is much more soluble. Ref: guyton and hall textbook of medical physiology 12 edition page number:348,349,350
Less dense
More soluble in plasma
Less molecular weight
Less PCO2 in the alveoli
Respiratory system