[Histological studies on the effects of aging upon the conduction system of the heart].
D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging; D001145:Arrhythmias, Cardiac / Q000473:pathology; D002648:Child; D002675:Child, Preschool; D006329:Heart Conduction System / Q000473:pathology*; D006801:Humans; D007223:Infant; D008875:Middle Aged