By a waterfall: "zone I and zone II phenomena" in obstructive lung disease.
D001794:Blood Pressure; D001991:Bronchitis / Q000503:physiopathology; D003371:Cough; D004417:Dyspnea / Q000503:physiopathology; D006801:Humans; D008171:Lung Diseases / Q000503:physiopathology*; D011187:Posture; D011652:Pulmonary Circulation; D011656:Pulmonary Emphysema / Q000503:physiopathology; D012039:Regional Blood Flow; D013575:Syncope / Q000503:physiopathology; D014692:Ventilation-Perfusion Ratio