BI-1711
Diffusion
Biology · Secondary 4 · Medium · Diffusion
Which statement correctly describes how oxygen moves from the air in the alveoli into the blood in the capillaries?
- By diffusion, from higher oxygen concentration in the alveoli to lower in the blood
- By osmosis, from higher water concentration in the blood to lower in the alveoli
- By active transport, using energy to move oxygen into the blood
- By diffusion, from lower oxygen concentration in the alveoli to higher in the blood
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