The electrocardiogram in health: the normal range.
D000200:Action Potentials; D004562:Electrocardiography; D006321:Heart / Q000502:physiology*; D006325:Heart Atria; D006329:Heart Conduction System / Q000502:physiology; D006352:Heart Ventricles; D006801:Humans; D005082:Physical Exertion; D012119:Respiration