title: Sarcomere length-tension relationship in toad atrioventricular pacemaker: length dependent activation.
mesh_terms: D000818:Animals; D001001:Anura; D001283:Atrioventricular Node / Q000648:ultrastructure*; D002118:Calcium / Q000378:metabolism; D006329:Heart Conduction System / Q000648:ultrastructure*; D008854:Microscopy, Electron; D009210:Myofibrils / Q000648:ultrastructure*; D012518:Sarcomeres / Q000648:ultrastructure*
chemical_list: D002118:Calcium