Patch-Clamp TechniquesMembrane PotentialsCalcium ChannelsPotassium ChannelsCalcium SignalingElectrophysiologyIon ChannelsGlucose Clamp TechniqueElectric ConductivityIon Channel GatingCalcium Channels, L-TypeSodium ChannelsCalciumAction PotentialsChloride ChannelsGuinea PigsPotassiumPotassium Channel BlockersBariumSodiumCalcium, DietaryCalcium Channel BlockersCells, CulturedDose-Response Relationship, DrugAdenosine TriphosphateKineticsChloridesPotassium Channels, Voltage-GatedHeart VentriclesNeuronsMyocardiumMyocytes, CardiacCalcium Channel AgonistsIon TransportSodium Channel BlockersPotassium Channels, Calcium-ActivatedHeartNifedipineRabbitsRats, Sprague-Dawley4-AminopyridineDihydropyridinesEgtazic AcidTetrodotoxinElectric StimulationRats, WistarTime FactorsAjmalineTetraethylammoniumCesiumVentricular FunctionCalcium CarbonateCell MembraneXenopus laevisCell LineCationsPotassium Channels, Inwardly RectifyingQuinidineHypotonic SolutionsTetraethylammonium CompoundsOocytesGlyburideSodium CyanideFura-2Heart AtriaMibefradilPinacidilNiflumic AcidChelating AgentsCalcium PhosphatesMuscle CellsDelayed Rectifier Potassium ChannelsCell Membrane PermeabilityFlufenamic AcidCalcium IsotopesNodose GanglionAcetylcholineNickelAnti-Arrhythmia Agentsgamma-Aminobutyric AcidCalcium ChlorideIntracellular FluidAnesthetics, InhalationGanglia, SpinalLarge-Conductance Calcium-Activated Potassium ChannelsMagnesiumSynaptic TransmissionThapsigarginSinoatrial NodeKATP ChannelsHydrogen-Ion ConcentrationProtein Kinase CModels, BiologicalCyclic AMPCaffeineIonsSodium-Calcium ExchangerCadmiumOsmolar ConcentrationReceptors, GABA-A