22. The Respiratory System
Respiration
Multiple Choice
Multiple ChoiceWhich gradient most directly determines the direction that oxygen and carbon dioxide molecules will move between the air in the alveoli and the blood:
A
The pressure gradient between alveolar air and the blood plasma.
B
The concentration gradient between the hemoglobin and the blood plasma.
C
The concentration gradient between carbon dioxide and oxygen.
D
The pressure gradient between the hemoglobin and alveolar air.
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