| Front | Describe how oxygen in the air reaches capillaries surrounding alveoli in the lungs. Details of breathing are not required. [4 marks] |
|---|---|
| Back | 1. Trachea and bronchi and bronchioles; 2. Down pressure gradient; 3. Down diffusion gradient; 4. Across alveolar epithelium; 5. Across capillary endothelium/epithelium; |
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