title: Relationship between calcium and hydrogen ions in heart muscle.
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism* / Q000494:pharmacology; D002415:Cats; D006859:Hydrogen / Q000378:metabolism* / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D009200:Myocardial Contraction; D009206:Myocardium / Q000378:metabolism*
chemical_list: D006859:Hydrogen; D002118:Calcium