Transport of carbon monoxide (CO) is diffusion limited because-: (A) High affinity of CO for hemoglobin, (B) Alveolar membrane is less permeable CO, (C) CO crosses epithelial barrier slowly, (D) ON exposure to air there is sudden increase in partial pressure
Answer is A. Ans. (a) High affinity of CO for hemoglobin(Ref: Ganong, 25th ed/p.640)The affinity of carbon monoxide for hemoglobin is about 210 times more than that of oxygen for hemoglobin