Physiology 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 💡 Explanation Transport of carbon monoxide (CO) is diffusion limited because- ✓ Correct Answer: A. High affinity of CO for hemoglobin