title: Calcium, caffeine, cardiac glycosides, and cardiac contractile function.
mesh_terms: D000818:Animals; D002110:Caffeine / Q000494:pharmacology*; D002118:Calcium / Q000378:metabolism*; D002301:Cardiac Glycosides / Q000494:pharmacology*; D004285:Dogs; D006801:Humans; D009200:Myocardial Contraction / Q000187:drug effects*; D009206:Myocardium / Q000378:metabolism*; D011690:Purkinje Fibers / Q000187:drug effects
chemical_list: D002301:Cardiac Glycosides; D002110:Caffeine; D002118:Calcium