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Chest Cavity: Increases
Air Pressure: Decreases
Diaphragm: contracts

*When we inhale the rushes into our lungs so our chest cavity will increase our diaphragm will contract.

Chest Cavity: decreases
Air Pressure: increases

*When we exhale the air will move out from the lungs. the lungs will go back to its origin size and the diaphragm will relax.
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