Sarcoplasmic ReticulumSarcoplasmic Reticulum Calcium-Transporting ATPasesCalcium-Transporting ATPasesCalciumUreaRyanodine Receptor Calcium Release ChannelRyanodineRabbitsCaffeineCalcium-Binding ProteinsCalcium SignalingEndoplasmic ReticulumCalsequestrinMyocardiumMyocardial ContractionCalcium ChannelsMyocytes, CardiacMusclesThapsigarginMuscle ProteinsTetracaineSodium-Calcium ExchangerKineticsAdenosine TriphosphateCalcium Channels, L-TypeEgtazic AcidHeart VentriclesAdenosine TriphosphatasesHeartCa(2+) Mg(2+)-ATPaseMuscle Fibers, SkeletalMuscle, SkeletalMuscle ContractionDogsPhosphorylationMembrane PotentialsArrhythmias, CardiacIsoproterenolAction PotentialsRuthenium RedDantroleneMagnesiumHeart FailureMicrosomesElectric StimulationBiological Transport, ActiveTime FactorsExcitation Contraction CouplingProton-Translocating ATPasesIntracellular MembranesSarcolemmaDose-Response Relationship, DrugDiastoleTerpenesBiological TransportOxalatesCalcium, DietaryMolecular Sequence DataProcaineMyofibrilsAmino Acid SequenceInositol 1,4,5-Trisphosphate ReceptorsCalcium RadioisotopesCells, CulturedCytosolHydrogen-Ion ConcentrationIndolesCalcium ChlorideMicroscopy, ElectronProtein BindingMalignant HyperthermiaVacuolar Proton-Translocating ATPasesHomeostasisMembrane ProteinsBuffersModels, BiologicalCell MembraneProtein ConformationCalcium Channel BlockersBinding SitesEnzyme InhibitorsPotassiumFluorescent DyesPatch-Clamp TechniquesVanadatesRats, Sprague-DawleyCalcimycinMicroscopy, ConfocalEndoplasmic Reticulum StressCalcium IsotopesIon TransportRats, WistarVanadiumAdenosine DiphosphateHydrolysisXanthenesCalcium Channel AgonistsElectrophysiologyMurexideSodium