Sarcoplasmic ReticulumSarcoplasmic Reticulum Calcium-Transporting ATPasesCalcium Channels, L-TypeCalcium-Transporting ATPasesCalciumCalcium ChannelsRyanodine Receptor Calcium Release ChannelRyanodineCalcium Channel BlockersRabbitsCaffeineCalcium SignalingCalcium-Binding ProteinsCalsequestrinMyocardiumEndoplasmic ReticulumMyocardial ContractionMyocytes, CardiacMusclesIon ChannelsThapsigarginKineticsMuscle ProteinsCalcium Channels, N-TypeTetracaineSodium-Calcium ExchangerEgtazic AcidAdenosine TriphosphateHeart VentriclesCalcium Channels, T-TypeMembrane PotentialsHeartCalcium Channel AgonistsMuscle ContractionIon Channel GatingMuscle, SkeletalMuscle Fibers, SkeletalDogsCa(2+) Mg(2+)-ATPaseAction PotentialsPhosphorylationArrhythmias, CardiacElectric StimulationRuthenium RedElectrophysiologyNifedipineIsoproterenolDantroleneDose-Response Relationship, DrugTime FactorsMagnesiumPatch-Clamp TechniquesHeart FailureMicrosomesDihydropyridinesPotassium Channels, Inwardly RectifyingCells, CulturedCalcium Channels, P-TypeCalcium Channels, Q-TypeSarcolemmaChloride ChannelsBiological Transport, ActivePotassium Channel BlockersCalcium Channels, R-TypeMolecular Sequence DataExcitation Contraction CouplingPotassiumAmino Acid SequenceElectric ConductivityIntracellular MembranesAdenosine TriphosphatasesRats, Sprague-DawleyVerapamilDiastoleInositol 1,4,5-Trisphosphate ReceptorsCalcium RadioisotopesDiltiazemomega-Conotoxin GVIACytosolModels, BiologicalProcaineOxalatesCell MembraneIsradipineTerpenesRats, WistarIndolesCalcium, DietaryIon TransportCalcium ChlorideMembrane ProteinsCell LineMyofibrilsProtein BindingPotassium Channels, Calcium-ActivatedPotassium Channels, Voltage-Gatedomega-ConotoxinsBariumBinding SitesBiological Transport