Action PotentialsMembrane PotentialsMembrane Potential, MitochondrialCell MembraneMembranesIntracellular MembranesElectrophysiologyPotassiumCalciumPatch-Clamp TechniquesMembrane LipidsTetrodotoxinElectric StimulationSodiumElectric ConductivityPotassium ChannelsMembranes, ArtificialNeuronsGuinea PigsCell Membrane PermeabilityIon ChannelsTime FactorsSodium ChannelsMitochondriaMicroelectrodesErythrocyte MembraneMembrane FluidityCells, CulturedNeural ConductionTetraethylammonium CompoundsKineticsHeartPotassium Channel Blockers4-AminopyridineVentricular FunctionSynaptic TransmissionAxonsModels, BiologicalChloridesSynapsesRats, Sprague-DawleyIon Channel GatingTetraethylammoniumHeart Conduction SystemBasement MembraneHydrogen-Ion ConcentrationCalcium ChannelsFluorescent DyesMitochondrial MembranesRabbitsValinomycinPyramidal CellsAdenosine TriphosphatePapillary MusclesPurkinje FibersDendritesDogsHeart VentriclesRats, WistarBariumPotassium Channels, Voltage-GatedMembrane Transport ProteinsDose-Response Relationship, DrugCell LineMyocytes, CardiacCalcium SignalingModels, NeurologicalEvoked PotentialsBiological Transport, ActiveCesiumMyocardiumAnuraSodium Channel BlockersExcitatory Postsynaptic PotentialsCalcium Channel BlockersMusclesMicroscopy, ElectronOuabainSynaptic MembranesCarbonyl Cyanide p-TrifluoromethoxyphenylhydrazoneLipid BilayersMembrane GlycoproteinsCalcium Channels, L-TypeMuscle ContractionNeurons, AfferentMotor NeuronsComputer SimulationModels, CardiovascularTrityl CompoundsAnti-Arrhythmia AgentsProtein TransportIon TransportDelayed Rectifier Potassium ChannelsTemperatureAnimals, NewbornCatsHippocampusArrhythmias, CardiacMyocardial ContractionRefractory Period, Electrophysiological