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Sagot :
Answer:
Oxygen and carbon dioxide, dissolved in water, are exchanged by diffusion in the lungs:
- oxygen moves down a concentration gradient from the air in the alveoli to the blood.
- carbon dioxide moves down a concentration gradient from the blood to the air in the alveoli.
Answer:
oxygen moves down a concentration gradient from the air in the alveoli to the blood.
carbon dioxide moves down a concentration gradient from the blood to the air in the alveoli.
Explanation:
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