Wakefulness-Promoting AgentsReceptors, Adrenergic, alpha-2YohimbineReceptors, Adrenergic, alphaAdrenergic alpha-AntagonistsAdrenergic alpha-2 Receptor AntagonistsAdrenergic alpha-AgonistsPrazosinImidazoline ReceptorsIdazoxanAdrenergic alpha-2 Receptor AgonistsClonidineNorepinephrineQuinoxalinesOxymetazolineGuanabenzPhenylephrineTetralonesAdrenergic alpha-1 Receptor AntagonistsMedetomidineBinding, CompetitiveRadioligand AssayReceptors, Adrenergic, alpha-1PhenoxybenzamineVasoconstrictionQuinolizinesReceptors, AdrenergicImidazolesalpha 1-AntitrypsinMuscle ContractionElectric StimulationReceptors, DrugRabbitsAzepinesDose-Response Relationship, DrugSaphenous VeinHypoxia-Inducible Factor 1, alpha SubunitReceptors, SerotoninSympathetic Nervous SystemRats, Inbred StrainsMuscle, Smooth, VascularArteriesDogs