BI-1678
Diffusion
Biology · Secondary 4 · Medium · Diffusion
Which statement correctly describes diffusion in the context of gas exchange in the lungs?
- Oxygen moves from the alveoli into the blood down a concentration gradient
- Oxygen moves from the blood into the alveoli against a concentration gradient
- Carbon dioxide moves from the blood into the alveoli against a concentration gradient
- Carbon dioxide moves from the alveoli into the blood down a concentration gradient
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