title: Comparative physiology of the cardiac pacemaker mechanism.
mesh_terms: D000200:Action Potentials; D000663:Amphibians / Q000502:physiology; D000818:Animals; D001341:Autonomic Nervous System / Q000502:physiology; D001693:Biological Transport, Active; D002118:Calcium / Q000378:metabolism; D002642:Chick Embryo; D002712:Chlorides / Q000502:physiology; D004558:Electric Stimulation; D005399:Fishes / Q000502:physiology; D006168:Guinea Pigs; D006321:Heart / Q000033:anatomy & histology; D006329:Heart Conduction System / Q000166:cytology / Q000378:metabolism / Q000502:physiology*; D007313:Insecta / Q000502:physiology; D008564:Membrane Potentials / Q000187:drug effects; D008974:Mollusca / Q000502:physiology; D009206:Myocardium / Q000166:cytology; D009431:Neural Conduction; D011188:Potassium / Q000378:metabolism; D011690:Purkinje Fibers / Q000502:physiology; D012849:Sinoatrial Node / Q000166:cytology / Q000378:metabolism / Q000502:physiology; D012964:Sodium / Q000378:metabolism
chemical_list: D002712:Chlorides; D012964:Sodium; D011188:Potassium; D002118:Calcium