22. The Respiratory System
Respiration
Multiple Choice
Multiple ChoiceFor internal respiration, which of the following must be true:
I. The total amount of CO2 exchanged equals the amount of O2 exchanged.
II. Carbon dioxide will move down its concentration gradient to enter the blood.
III. The partial pressure of O2 in the tissue before gas exchange is ≥ 40 mm Hg.
A
I only.
B
I and II.
C
III only.
D
I, II, and III are true.
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