Breathing in: Ribs up and outwards, Diaphragm contracts (flattens), Chest volume increases, Rib muscles contract, Pressure in lungs decreases, Air flows into lungs, Breathing out: Ribs down and in, Diaphragm relaxes (dome shape), Chest volume decreases, Rib muscles relax, Pressure in lungs increases, Air flows out of lungs,

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