OxytocinMuscle ContractionIsometric ContractionUterine ContractionOxytocicsVasotocinMyocardial ContractionMuscle, SmoothVasopressinsMyometriumMilk EjectionDinoprostSupraoptic NucleusNeurophysinsElectric StimulationPituitary Gland, PosteriorCalciumLabor, ObstetricMuscle, SkeletalVasoconstrictionIsotonic ContractionGuinea PigsUterusPregnancyOrnipressinMuscle RelaxationElectromyographyMuscle, Smooth, VascularDose-Response Relationship, DrugMuscle FatiguePotassium ChlorideRats, WistarRats, Sprague-DawleyVasoconstrictor AgentsGastrointestinal MotilityProgesteroneNorepinephrineUrinary BladderParaventricular Hypothalamic NucleusTracheaAcetylcholineTime FactorsRabbitsPeristalsisLabor, InducedEstrusLactationMusclesAtropinePhenylephrineTocolytic AgentsPregnancy, AnimalSheepVas DeferensProstaglandins FCarbacholMuscle TonusCorpus LuteumHypothalamusIleumNifedipineAorta, ThoracicDogsLuteolysisMaternal BehaviorSerotoninTorquePotassiumCaffeine15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidMyosin Light Chainsrho-Associated KinasesCalcium Channel BlockersPair BondAction PotentialsHormone AntagonistsSocial BehaviorHistamineLypressinParasympatholyticsPressureMotor NeuronsReflexEndometriumMesenteric ArteriesUterine InertiaMuscle Fibers, SkeletalMyosinsEnzyme InhibitorsRats, Inbred StrainsVerapamilProstaglandinsIndomethacinPostpartum HemorrhageCattleRadioimmunoassayAdrenergic alpha-AgonistsSwineArteriesCells, Cultured