<prompt> CO2 diffuses more easily through the respiratory membrane than O2 because it is-Less denseMore soluble in plasmaLess molecular weightLess PCO2 in the alveoli  <response>: Ans. b More soluble in plasmaRef: Ganong, 25th edp.639The diffusion coefficient of CO2 is about 20 times that of O2 . So, CO2 diffuses much faster and easily than O2 