Biology for IGCSE & O level - Gas Exchange In Humans (Section 4 - No. 9)
What happens to the concentration of oxygen and carbon dioxide in the blood as it passes through the capillaries surrounding the alveoli?
Oxygen increases, carbon dioxide increases
Oxygen increases, carbon dioxide decreases
Oxygen decreases, carbon dioxide increases
Oxygen decreases, carbon dioxide decreases
Explanation
Oxygen diffuses from the alveoli into the blood, while carbon dioxide diffuses from the blood into the alveoli.
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