22. Respiratory System
Gas Transport
Multiple Choice
Multiple ChoiceIn the alveoli, the partial pressure of oxygen is __________.
A
equal to that in the tissues
B
lower than the PO2 of systemic venous blood
C
much higher than the PO2 of systemic arterial blood
D
equal to the PO2 of systemic venous blood
E
approximately 104 millimeters of mercury
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