5. Breathing in and breathing out.
D000328:Adult; D000402:Airway Obstruction / Q000503:physiopathology; D000818:Animals; D002591:Cetacea / Q000502:physiology; D002648:Child; D004947:Esophagus / Q000502:physiology; D005260:Female; D006801:Humans; D008168:Lung / Q000502:physiology* / Q000503:physiopathology; D008170:Lung Compliance; D008297:Male; D008449:Maximal Expiratory Flow-Volume Curves; D008875:Middle Aged; D011187:Posture; D011650:Pulmonary Alveoli / Q000502:physiology; D012119:Respiration