* diaphragm: contracts, moves down * rib cage: up and out, intercostal muscles contract * chest cavity: increases * pressure in chest cavity: decreases * direction of air: into lungs
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Exhalation
* diaphragm: moves up, relaxes * rib cage: down and in, intercostal muscles relax * chest cavity: decreases * pressure in chest cavity: increases * direction of air: out of lungs