New concept on the mechanism of the first heart sound.
D000818:Animals; D004285:Dogs; D006321:Heart / Q000502:physiology*; D006326:Heart Auscultation; D006327:Heart Block / Q000175:diagnosis; D006351:Heart Valves / Q000502:physiology; D006801:Humans; D010701:Phonocardiography; D016276:Ventricular Function