5. Capillaries surround the alveoli in the lungs. Which pair of statements correctly describes the concentrations of oxygen and carbon dioxide in the lungs?
A. Oxygen: Higher in the capillaries, Carbon dioxide: Higher in the alveoli
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B. Oxygen: Lower in the capillaries, Carbon dioxide: Higher in the alveoli
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C. Oxygen: Lower in the alveoli, Carbon dioxide: Higher in the capillaries
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D. Oxygen: Higher in the alveoli, Carbon dioxide: Higher in the capillaries
