Electric ImpedanceOphthalmic ArteryConductometryPlethysmography, ImpedanceDifferential Thermal AnalysisCiliary ArteriesElectric ConductivityBody Fluid CompartmentsNanowiresThoracicaRetinal ArteryUltrasonography, Doppler, ColorPolychaetaElectrophysiologyDecapodiformesMicroelectrodesRadioisotope Dilution TechniqueMembrane PotentialsExtracellular FluidCytoplasmMathematicsHeart Conduction SystemAction PotentialsElectrodesExtracellular SpaceModels, NeurologicalMaterials TestingAxonsBlood Flow VelocityDendritesComputer SimulationVascular ResistanceSeawaterTemperatureSpectrum AnalysisMusclesHeartModels, BiologicalElectric StimulationTime Factors