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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.
Breathing is a physical process consisting of inhalation, exhalation, and relaxation. Inhalation is an active process while exhalation is passive. Breathing involves two stages known as ventilation and gas exchange. Ventilation is the movement of the air in and out of the lungs.