Breathing in: Ribs up and outwards, Diaphragm contracts (flattens), Thorax volume increases, Intercostal muscles contract, Air pressure in lungs decreases, Air flows into lungs from high to low pressure, Breathing out: Ribs down and in, Diaphragm relaxes (dome shape), Thorax volume decreases, Intercostal muscles relax, Air pressure in lungs increases, Air flows out of lungs from high to low pressure,

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