title: Maintenance of upper airway patency.
mesh_terms: D000328:Adult; D000402:Airway Obstruction / Q000503:physiopathology / Q000628:therapy*; D001049:Apnea / Q000503:physiopathology; D002648:Child; D006801:Humans; D007223:Infant; D009132:Muscles / Q000502:physiology / Q000503:physiopathology; D012123:Pulmonary Ventilation; D012143:Respiratory Physiological Phenomena; D012137:Respiratory System / Q000503:physiopathology; D012891:Sleep Apnea Syndromes / Q000503:physiopathology