Biology for IGCSE & O level - Gas Exchange In Humans (Section 1 - No. 48)
What change in the concentration of gases occurs during gas exchange in the alveoli?
Oxygen decreases and carbon dioxide decreases.
Oxygen increases and carbon dioxide increases.
Oxygen decreases and carbon dioxide increases.
Oxygen increases and carbon dioxide decreases.
Explanation
Oxygen diffuses from the alveoli into the capillaries, while carbon dioxide diffuses from the capillaries into the alveoli.
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