Breathing is another term for pulmonary ventilation. It is the process of air moving into and out of the lungs during inspiration (inhalation) and expiration (expiration) (exhalation).
Because of pressure differences between the environment and the gases inside the lungs, air moves. During breathing, the lungs are passive, which means they do not create the movement that aids inspiration and expiration.
Air, like other gases, moves from a higher pressure zone to a lower pressure region. Muscular breathing motions and elastic tissue rebound cause pressure changes that result in ventilation. Three distinct pressures are involved in pulmonary ventilation:
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