Exhalation: Air expelled from the lungs, Intercostal muscles contract, Ribs move inward and down, Diaphragm relaxes, Diaphragm becomes dome shaped, Chest cavity volume decreases, Chest cavity pressure increases, Lungs deflate, High level of O2 coming in, low level of CO2 coming in, Air is less moist, Inhalation: Air flows into the lungs, Intercostal muscles relax, Ribs move out and up, Diaphragm contacts, Diaphragm flattens, Chest cavity volume increases, Chest cavity pressure decreases, Lungs inflate, Low level of O2 going out, High level of CO2 going out, Air is more moist,

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