If breathing is controlled by the diaphragm, wouldn’t trying to take a deep breath just create the necessary vacuum inside the chest cavity to allow air to reenter a lung that had all the air forced out of it?
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Imagine a balloon in a glass tube. The top of the balloon is attached to the top of the tube, and the bottom of the tube has a plunger that can go in and out. If you pull the plunger out, it creates a vacuum and the balloon inflates. When you push the plunger back, the balloon deflates.
Now, put a hole in the balloon, or in the glass tube. Now, no matter what you do with the plunger, the balloon isn’t going to inflate. That’s what’s happening with a collapsed lung.
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