title: The second heart sound.
mesh_terms: D001011:Aorta / Q000502:physiology; D001696:Biomechanical Phenomena; D002318:Cardiovascular Diseases / Q000503:physiopathology; D006321:Heart / Q000502:physiology; D006326:Heart Auscultation; D006347:Heart Sounds / Q000187:drug effects; D006801:Humans; D008168:Lung / Q000502:physiology; D014636:Valsalva Maneuver; D014655:Vascular Resistance / Q000187:drug effects