The intercoastal muscles (between the ribs) contract, the rib cage moves up and out, meanwhile the diaphragm contracts and flattens, both make the volume of the lungs increase, so now the air pressure inside the lungs is less than the air outside the body, air flows into the lungs, through the trachea, bronchi, bronchioles, oxygen diffuses into the blood from the alveoli

Inhalation

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