Under what conditions will the alveolar PACO2 rise above normal?
a. If both metabolic rate and ventilation in-crease (e.g., through exercise)
b. If carbon dioxide production decreases relative to VA
c. If VA decreases relative to carbon dioxide production
d. When the patient is febrile
ANS: C
The PACO2 will increase above this level if carbon dioxide production increases while alveolar ventilation remains constant or when alveolar ventilation decreases while CO2 remains constant.
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