![]() The body's circulatory system transports these gases to and from the cells, where "cellular respiration" takes place. Breathing, or "external respiration", brings air into the lungs where gas exchange takes place in the alveoli through diffusion. Real-time magnetic resonance imaging of the human thorax during breathing X-ray video of a female American alligator while breathing.īreathing (or ventilation) is the process of moving air into and from the lungs to facilitate gas exchange with the internal environment, mostly to flush out carbon dioxide and bring in oxygen.Īll aerobic creatures need oxygen for cellular respiration, which extracts energy from the reaction of oxygen with molecules derived from food and produces carbon dioxide as a waste product. For other uses, see Breathing (disambiguation).
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