Membrane PotentialsMembrane Potential, MitochondrialCell MembraneIntracellular MembranesMembranesMembrane LipidsMyocardial ContractionMembranes, ArtificialCalciumPotassiumCell Membrane PermeabilityMitochondriaErythrocyte MembraneMembrane FluiditySodiumMuscle ContractionElectrophysiologyAction PotentialsElectric ConductivityTime FactorsBasement MembranePatch-Clamp TechniquesCells, CulturedMitochondrial MembranesIon ChannelsValinomycinHydrogen-Ion ConcentrationPotassium ChannelsGuinea PigsMyocardiumAdenosine TriphosphateHeartUterine ContractionMembrane Transport ProteinsModels, BiologicalMuscle, SmoothChloridesRats, Sprague-DawleyElectric StimulationCell LineDose-Response Relationship, DrugFluorescent DyesNeuronsKineticsLipid BilayersDogsRabbitsMembrane GlycoproteinsMyocytes, CardiacBiological Transport, ActiveMicroscopy, ElectronTrityl CompoundsProtein TransportRats, WistarCarbonyl Cyanide p-TrifluoromethoxyphenylhydrazoneOuabainCalcium SignalingCarbonyl Cyanide m-Chlorophenyl HydrazoneCarrier ProteinsMicroscopy, FluorescenceSynaptic MembranesTetrodotoxinMicroelectrodesPotassium ChlorideApoptosisLiposomesSignal TransductionProtein BindingHeart VentriclesSodium-Potassium-Exchanging ATPaseMicroscopy, ConfocalIon Channel GatingMutationPotassium Channel BlockersCalcium ChannelsCarbocyaninesMyometriumAcetylcholinePermeabilityIsoproterenolReactive Oxygen SpeciesMolecular Sequence DataEnzyme InhibitorsProtein Structure, TertiaryTemperaturePapillary MusclesBlotting, WesternBariumOnium CompoundsCytosolEscherichia coliNigericinCell FractionationCardiotonic AgentsTetraethylammonium CompoundsIon TransportTetraethylammoniumCattleActinsVentricular Function