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.
Answer: B) Alveolar PO2 decreases; blood and tissue PCO2 decreases.
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