ArteriolesMuscle ContractionIsometric ContractionUterine ContractionVasoconstrictionMyocardial ContractionVasodilationPia MaterMuscle, SmoothMuscle, Smooth, VascularMuscle, SkeletalVenulesRetinal ArteryMicrocirculationElectric StimulationVasoconstrictor AgentsCalciumVasodilator AgentsAcetylcholineGuinea PigsPotassium ChlorideIsotonic ContractionRats, Sprague-DawleyNitric OxideNorepinephrineDose-Response Relationship, DrugEndothelium, VascularMuscle TonusArteriesMuscle RelaxationRats, WistarEnzyme InhibitorsNitroarginineRabbits15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidMuscle FatiguePhenylephrineIndomethacinMusclesElectromyographyNitroprussideNifedipineCheekNG-Nitroarginine Methyl EsterVasomotor SystemRegional Blood FlowMicroscopy, VideoCerebral ArteriesCoronary VesselsBlood PressureGastrointestinal MotilityMesenteric ArteriesNitric Oxide SynthaseTracheaDogsJuxtaglomerular ApparatusCalcium Channel BlockersTime FactorsMyographyPeristalsisIleumUrinary BladderSwineRats, Inbred WKYEndothelin-1CapillariesAdrenergic alpha-AgonistsStress, MechanicalVascular ResistanceEndothelinsAdenosineAtropineSerotoninrho-Associated KinasesRats, Inbred SHRCatsPotassiumVas DeferensBradykininPressureCalcium SignalingRenal CirculationNitric Oxide Synthase Type IIIAorta, ThoracicMesoporphyrinsProstaglandinsMesocricetusThromboxane A2Myosin Light ChainsSwine, MiniatureCarbacholPrazosinAdenosine TriphosphateHistamineTorqueAngiotensin IIBlood Flow VelocityCyclooxygenase InhibitorsMotor NeuronsMembrane Potentials