Inhalation: Intercostals Contract, Diaphragm contracts, Ribs Move Up and out, Chest cavity expands, Pressure in the lungs decrease, air rushes into the lungs, Exhalation: Intercostals relax, Diaphragm relaxes, Ribs move in and down, Chest cavity constricts, Pressure in the lungs increases, air rushes out of the lungs,

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