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pursed-lip breathing a breathing technique in which air is inhaled slowly through the nose and then exhaled slowly through pursed lips. This type of breathing is often used by patients with chronic obstructive pulmonary disease to prevent small airway collapse.
For other uses, see Breathing (disambiguation) . Breathing is the process that moves air in and out of the lungs, or oxygen through other respiratory organs such as gills. For organisms with lungs, breathing is also called ventilation, which includes both inhalation and exhalation.Breathing is one part of physiological respiration required to sustain life.Aerobic organisms of birds, mammals, and reptilesârequire oxygen to release energy via cellular respiration, in the form of the metabolism of energy-rich molecules such as glucose.reathing is only one of the processes that deliver oxygen to where it is needed in the body and remove carbon dioxide. Another important process involves the movement of blood by the circulatory system.