title: Refractoriness of cardiac tissue.
mesh_terms: D000200:Action Potentials / Q000187:drug effects; D000328:Adult; D001283:Atrioventricular Node / Q000502:physiology; D002036:Bundle of His / Q000502:physiology; D002037:Bundle-Branch Block / Q000503:physiopathology; D005117:Cardiac Complexes, Premature / Q000503:physiopathology; D004056:Differential Threshold; D004562:Electrocardiography; D006329:Heart Conduction System / Q000502:physiology* / Q000503:physiopathology; D006801:Humans; D008297:Male; D008564:Membrane Potentials / Q000187:drug effects; D013610:Tachycardia / Q000503:physiopathology; D013997:Time Factors