title: The third heart sound.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D006321:Heart / Q000503:physiopathology*; D006326:Heart Auscultation; D006331:Heart Diseases / Q000503:physiopathology*; D006347:Heart Sounds; D006801:Humans