title: Properties of cardiac contractions in zero sodium solutions: intracellular free calcium controls slow channel conductance.
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism*; D000242:Cyclic AMP / Q000378:metabolism; D006152:Cyclic GMP / Q000378:metabolism; D004533:Egtazic Acid / Q000494:pharmacology; D004558:Electric Stimulation; D006168:Guinea Pigs; D007474:Ion Exchange; D007545:Isoproterenol / Q000494:pharmacology; D008297:Male; D009200:Myocardial Contraction; D051381:Rats; D012964:Sodium / Q000378:metabolism*; D013045:Species Specificity; D013324:Strontium / Q000494:pharmacology
chemical_list: D004533:Egtazic Acid; D012964:Sodium; D000242:Cyclic AMP; D006152:Cyclic GMP; D007545:Isoproterenol; D002118:Calcium; D013324:Strontium