title: Are there internodal tracts? Yes.
mesh_terms: D004594:Electrophysiology; D006321:Heart / Q000033:anatomy & histology* / Q000196:embryology / Q000502:physiology; D006329:Heart Conduction System / Q000502:physiology; D006801:Humans; D008854:Microscopy, Electron; D009200:Myocardial Contraction; D011188:Potassium / Q000502:physiology; D011690:Purkinje Fibers / Q000502:physiology
chemical_list: D011188:Potassium