Chromaffin CellsCatecholaminesChromaffin SystemAdrenal MedullaChromaffin GranulesAdrenal GlandsExocytosisCattleChromogranin AChromograninsEpinephrineNorepinephrineDimethylphenylpiperazinium IodideCalciumSplanchnic NervesDopamine beta-HydroxylaseDigitoninMicrochip Analytical ProceduresNicotineSecretory VesiclesVeratridinePhenylethanolamine N-MethyltransferasePheochromocytomaPC12 CellsCells, CulturedMuscarineReserpineAdrenal Gland NeoplasmsPotassiumAcetylcholineTyramineElectric CapacitanceReceptors, NicotinicElectrochemistryHexamethonium CompoundsDopamineCalcium ChannelsTyrosine 3-MonooxygenasePituitary Adenylate Cyclase-Activating PolypeptideCalcium Channel BlockersCatsReceptors, CatecholamineElectric StimulationKineticsNicotinic AgonistsMembrane PotentialsGanglionic StimulantsCell Membrane PermeabilityPerfusionBariumSympathetic Nervous SystemPatch-Clamp TechniquesCalcium SignalingPotassium ChlorideDose-Response Relationship, DrugGallopamilStimulation, ChemicalTime FactorsNitrendipineElectrophysiologyHistamineSodiumCarotid BodyCytosolPropranololCarbacholEnkephalin, MethionineEnterochromaffin CellsAdenosine TriphosphateIsradipineAtropineCell MembraneOuabainPara-Aortic BodiesHeart RatePeptide FragmentsRats, Sprague-DawleyMicroelectrodesCyclic AMPProtein Kinase CCalcimycinBlood PressureEnkephalinsChromogranin BCytoplasmic GranulesNeurotransmitter AgentsAction PotentialsNeuropeptidesSynaptosomal-Associated Protein 25Rats, WistarDogsNicotinic AntagonistsMagnesiumGuinea PigsNormetanephrineAdrenergic beta-AntagonistsNerve Tissue ProteinsTetrabenazineHemodynamicsCalcium Radioisotopes