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the diaphragm tightens (moves down) expanding the lungs. This expansion creates the pressure in the lungs to decrease. Since nature always strives for equilibrium, high pressure moves to low pressure areas --> air fills the lungs. the diaphragm relaxes, moving back up in the chest cavity, increasing the pressure on the contents in the lungs. The air escapes the lungs to reach the lower pressure area outside our body.

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