If tissue oxygen demand increases and respiratory rate and tidal volume remain the same,what happens? A)Alveolar PO₂ increases; blood and tissue PCO₂ decreases. B)Alveolar PO₂ decreases; blood and tissue PCO₂ decreases. C)Alveolar PO₂ increases; blood and tissue PCO₂ increases.

Question

Quizplus · Accepted Answer

If tissue oxygen demand increases without a change in respiratory rate and tidal volume, alveolar PO2 decreases because more oxygen is being extracted from the alveoli. Blood and tissue PCO2 would increase due to increased CO2 production from heightened metabolic activity without an increase in ventilation to remove it.

If Tissue Oxygen Demand Increases and Respiratory Rate and Tidal