Oxygen in the alveoli enters the blood in capillaries via diffusion across the alveolar epithelium and the capillary endothelium.
Oxygen in the alveoli enters the blood in capillaries via diffusion across the alveolar epithelium and the capillary endothelium.
| Front | Describe how oxygen in air in the alveoli enters the blood in capillaries. ( 2 marks) |
|---|---|
| Back | Diffusion; Across (alveoli) epithelium / (capillary) endothelium; |
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