Breathing in (Inhalation): Ribs move up and out, External intercostal muscles pull ribs, Diaphragm contracts & flattens, More space in the lungs and thoracic cavity, Lower pressure in the lungs, Air flows in., Accessory muscles : Scalene and Sternocleidomastoid , Breathing out (Exhalation): Ribs move down and in, Internal intercostal muscles pull ribs, Diaphragm relaxes & domes , Less space in the lungs and thoracic cavity, High pressure in the lungs, Air flows out, Accessory muscles: Transverse and Rectus Abdominis,

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