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When is the air pressure in the lungs greater than the air pressure outside the body?
When you exhale.
What is the function of the diaphragm?
A sheet of muscle in the lower chest that moves downward as you breathe in.
What are the two causes of swelling within the respiratory system?
Bacteria, viruses, and other micro-organisms. Also breathing in smoke, polluted air, coal dust and asbestos.
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