Neurotransmitter AgentsNorepinephrineSerotoninNeurotransmitter Transport ProteinsDopamineSynaptic Transmissiongamma-Aminobutyric AcidPhenoxybenzamineNeuronsCatecholaminesTyramineElectric StimulationReceptors, NeurotransmitterGlutamic AcidEpinephrineSynaptic VesiclesAcetylcholinePlasma Membrane Neurotransmitter Transport ProteinsAdrenergic alpha-AntagonistsSympathetic Nervous SystemPhentolamineDesipramineReserpineBiogenic MonoaminesVas DeferensBrainReceptors, AdrenergicCalciumAdrenergic alpha-AgonistsPresynaptic TerminalsSynaptosomesHydroxydopaminesPrazosinSynapsesRats, Sprague-DawleyDose-Response Relationship, DrugReceptors, Adrenergic, alphaSympathomimeticsNeuropeptidesRats, WistarGuanethidineMuscle ContractionPropranolol