<prompt> Transport of carbon monoxide CO is diffusion limited because-High affinity of CO for hemoglobinAlveolar membrane is less permeable COCO crosses epithelial barrier slowlyON exposure to air there is sudden increase in partial pressure  <response>: Ans. a High affinity of CO for hemoglobinRef: Ganong, 25th edp.640The affinity of carbon monoxide for hemoglobin is about 210 times more than that of oxygen for hemoglobin 