title: Automaticity and automatic rhythms.
mesh_terms: D000200:Action Potentials; D001145:Arrhythmias, Cardiac / Q000209:etiology / Q000503:physiopathology; D002306:Cardiac Volume; D004558:Electric Stimulation; D006329:Heart Conduction System / Q000502:physiology* / Q000503:physiopathology; D006801:Humans; D008564:Membrane Potentials; D012849:Sinoatrial Node / Q000502:physiology; D013268:Stimulation, Chemical; D014630:Vagus Nerve / Q000502:physiology