Inspiration: intercostal muscles contract, rib cage moves up and out, diaphragm contracts - moves down and flattens, volume of the thorax ( chest cavity) increases, pressure inside thorax decreases, lungs inflate and draws air in, Expiration: intercostal muscles relax, rib cage moves down and in, diaphragm relaxes- moves up, volume of the thorax ( chest cavity) decreases, pressure inside thorax increases, air pushed out of lungs,

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