Biology for IGCSE & O level - Gas Exchange In Humans (Section 4 - No. 35)
What happens to the concentration gradient of oxygen and carbon dioxide during gas exchange in the lungs?
Oxygen diffuses into the blood; carbon dioxide diffuses into the alveoli
Oxygen diffuses into the alveoli; carbon dioxide diffuses into the blood
Both oxygen and carbon dioxide diffuse into the blood
Both oxygen and carbon dioxide diffuse into the alveoli
Explanation
Oxygen enters blood, and carbon dioxide enters alveoli due to concentration gradients.
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