BI-435
Diffusion
Biology · Secondary 3 · Medium · Diffusion
Oxygen moves from the air in an alveolus into the blood. Which statement best describes this movement?
- Oxygen diffuses into the blood because its concentration is higher in the alveolus.
- Oxygen diffuses into the blood because its concentration is higher in the blood.
- Oxygen is pumped into the blood using energy from the alveolar cells.
- Oxygen moves into the blood only when there is no concentration gradient.
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