CO2 diffuses more easily through the respiratory membrane than O2 because it is-: (A) Less dense, (B) More soluble in plasma, (C) Less molecular weight, (D) Less PCO2 in the alveoli
Answer is B. Ans. (b) More soluble in plasma(Ref: Ganong, 25th ed/p.639)The diffusion coefficient of CO2 is about 20 times that of O2 . So, CO2 diffuses much faster and easily than O2