NorepinephrineVasoconstrictor AgentsInfusions, IntravenousDogsBlood PressureShock, SepticHemodynamicsCoronary CirculationHeart RateNorepinephrine Plasma Membrane Transport ProteinsInfusions, ParenteralInfusion PumpsEpinephrineInfusions, Intra-ArterialSympathetic Nervous SystemCatecholaminesAdrenergic Uptake InhibitorsDesipramineAdrenergic alpha-AgonistsDose-Response Relationship, DrugDopamine beta-HydroxylaseReceptors, Adrenergic, alphaRats, Sprague-DawleyAdrenergic alpha-AntagonistsReceptors, AdrenergicDopamineInfusion Pumps, ImplantableLocus CoeruleusTyraminePropranololReceptors, Adrenergic, alpha-2VasoconstrictionSympathomimeticsPhentolamineVascular ResistanceReceptors, Adrenergic, betaMethoxyhydroxyphenylglycolAdrenergic AgentsTime FactorsAngiotensin IIYohimbinePrazosinBiogenic MonoaminesRegional Blood FlowRats, Inbred StrainsSerotoninReceptors, Adrenergic, alpha-1IsoproterenolAdrenergic alpha-2 Receptor AntagonistsAdrenergic FibersHypertensionHeartMicrodialysisInfusions, SubcutaneousAdrenergic AntagonistsNeurotransmitter Uptake InhibitorsPhenylephrineClonidineNormetanephrineInfusions, IntralesionalMyocardiumInsulinForearmAdrenergic beta-AntagonistsAdrenergic AgonistsRats, WistarReninElectric StimulationInjections, IntravenousPropylamines