1. What are the usual changes in intrapleural pressure during normal breathing?

2. What basic physics underlies Jack’s sudden difficulty breathing?

3. Why is lung from a COPD patient easier to inflate than a healthy one?

4. Why does this make breathing harder?

5. How does a collapsed lung lower PaO2 when the other lobe is fine?

6. How did the chest drain re-inflate Jack’s lung?

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