The effects of isoprenaline and tyramine on the  45 calcium uptake, the total calcium content and the contraction force of isolated guinea-pig atria in dependence on different extracellular hydrogen ion concentrations.
D000818:Animals; D002118:Calcium / Q000378:metabolism*; D002127:Calcium Isotopes; D005110:Extracellular Space; D006168:Guinea Pigs; D006321:Heart / Q000187:drug effects; D006325:Heart Atria; D006863:Hydrogen-Ion Concentration; D007545:Isoproterenol / Q000494:pharmacology*; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects; D009206:Myocardium / Q000378:metabolism*; D009638:Norepinephrine; D014439:Tyramine / Q000494:pharmacology*
D002127:Calcium Isotopes; D007545:Isoproterenol; D002118:Calcium; D009638:Norepinephrine; D014439:Tyramine