Action PotentialsMembrane PotentialsMembrane Potential, MitochondrialCell MembraneMembranesIntracellular MembranesPotassiumElectrophysiologyCalciumIon ChannelsPatch-Clamp TechniquesMembrane LipidsSodiumTetrodotoxinElectric ConductivityPotassium ChannelsElectric StimulationMembranes, ArtificialNeuronsGuinea PigsCell Membrane PermeabilityIon Channel GatingSodium ChannelsTime FactorsMitochondriaMicroelectrodesErythrocyte MembraneMembrane FluidityIon TransportTetraethylammonium CompoundsNeural ConductionChloridesPotassium Channel BlockersCells, Cultured4-AminopyridineHeartSynaptic TransmissionVentricular FunctionKineticsHydrogen-Ion ConcentrationAxonsSynapsesTetraethylammoniumRats, Sprague-DawleyCalcium ChannelsHeart Conduction SystemBasement MembraneModels, BiologicalFluorescent DyesMitochondrial MembranesValinomycinRabbitsPyramidal CellsDendritesAdenosine TriphosphatePurkinje FibersBariumPapillary MusclesDogsPotassium Channels, Voltage-GatedHeart VentriclesRats, WistarMembrane Transport ProteinsDose-Response Relationship, DrugCell LineCesiumMyocytes, CardiacCalcium SignalingBiological Transport, ActiveModels, NeurologicalEvoked PotentialsAnuraExcitatory Postsynaptic PotentialsCalcium Channel BlockersMyocardiumSodium Channel BlockersLipid BilayersOuabainMicroscopy, ElectronSynaptic MembranesMusclesCalcium Channels, L-TypeCarbonyl Cyanide p-TrifluoromethoxyphenylhydrazoneMembrane GlycoproteinsNeurons, AfferentTrityl CompoundsMagnesiumDelayed Rectifier Potassium ChannelsComputer SimulationMotor NeuronsProtein TransportTemperatureAnti-Arrhythmia AgentsModels, CardiovascularMuscle ContractionHippocampusAnimals, NewbornArrhythmias, CardiacRefractory Period, ElectrophysiologicalEgtazic Acid