inhalation: oxygen goes in , diafragm is contracted ,rib cage expands exhalation: carbon dioxide goes out , diafragm is relaxed, rib cage returns to resting position, diafragm moves up
inhalation: oxygen goes in , diafragm is contracted ,rib cage expands exhalation: carbon dioxide goes out , diafragm is relaxed, rib cage returns to resting position, diafragm moves up
