Action PotentialsMembrane PotentialsMembrane Potential, MitochondrialCell MembraneMembranesIntracellular MembranesElectrophysiologyPotassiumCalciumPatch-Clamp TechniquesMembrane LipidsTetrodotoxinElectric StimulationPotassium ChannelsSodiumElectric ConductivityMembranes, ArtificialNeuronsGuinea PigsCell Membrane PermeabilityIon ChannelsSodium ChannelsTime FactorsMitochondriaErythrocyte MembraneMicroelectrodesMembrane FluidityNeural ConductionTetraethylammonium CompoundsPotassium Channel Blockers4-AminopyridineCells, CulturedHeartVentricular FunctionSynaptic TransmissionAxonsSynapsesChloridesBasement MembraneIon Channel GatingRats, Sprague-DawleyTetraethylammoniumHeart Conduction SystemMitochondrial MembranesCalcium ChannelsFluorescent DyesKineticsValinomycinPyramidal CellsHydrogen-Ion ConcentrationModels, BiologicalDendritesPurkinje FibersPapillary MusclesRabbitsHeart VentriclesDogsRats, WistarAdenosine TriphosphatePotassium Channels, Voltage-GatedBariumMembrane Transport ProteinsMyocytes, CardiacCalcium SignalingDose-Response Relationship, DrugCell LineEvoked PotentialsModels, NeurologicalCesiumExcitatory Postsynaptic PotentialsSodium Channel BlockersAnuraBiological Transport, ActiveCalcium Channel BlockersMyocardiumSynaptic MembranesMicroscopy, ElectronOuabainLipid BilayersMembrane GlycoproteinsCarbonyl Cyanide p-TrifluoromethoxyphenylhydrazoneCalcium Channels, L-TypeMusclesNeurons, AfferentTrityl CompoundsMotor NeuronsDelayed Rectifier Potassium ChannelsAnti-Arrhythmia AgentsProtein TransportIon TransportModels, CardiovascularMuscle ContractionHippocampusAnimals, NewbornArrhythmias, CardiacRefractory Period, ElectrophysiologicalComputer SimulationCatsCarbonyl Cyanide m-Chlorophenyl HydrazoneTemperature