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| Q. |
Regarding gas exchange in the lungs: |
| A. | N2O is diffusion limited |
| B. | CO is perfusion limited |
| C. | O2 is between N2O and CO but at rest, is perfusion limited |
| D. | diffusing capacity of the lung for a gas is inversely proportionate to the surface area of the alveolocapillary membrane and directly proportional to its thickness |
| E. | at rest, it takes blood 0.25secs to traverse the pulmonary capillaries |
| Answer» C. O2 is between N2O and CO but at rest, is perfusion limited | |
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