Your lungs cannot be completely emptied of air because the trachea is held open by cartilage and the alveoli are kept open by elastic fibers.
Your lungs cannot be completely emptied of air because the trachea is held open by cartilage and the alveoli are kept open by elastic fibers.
| Front | Suggest why it is not possible to expel all the air from the lungs. |
|---|---|
| Back | trachea held open by cartillage and alveoli held open by elastic fibres |
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