The transport of CO is diffusion limited because_______________?
Correct answer: B. Bind avidly with Hb
- A. Partial pressure of CO is less
- B. Bind avidly with Hb
- C. CO is less absorbed in water
- D. Alveolar membrane is less permeable
Explanation
Carbon monoxide binds haemoglobin very avidly, so capillary blood maintains an extremely low dissolved CO partial pressure and continued diffusion from alveoli. This prevents equilibration and makes CO transfer diffusion limited.
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