SpasmSpasms, InfantileMuscle ContractionHemifacial SpasmIsometric ContractionCoronary VasospasmEsophageal Spasm, DiffuseUterine ContractionMyocardial ContractionErgonovineMuscle, SmoothAngina Pectoris, VariantFacial MusclesVasoconstrictionElectric StimulationMuscle, SkeletalIsotonic ContractionCalciumGuinea PigsAcetylcholineElectromyographyBlepharospasmMuscle RelaxationMuscle, Smooth, VascularVasoconstrictor AgentsPotassium ChlorideMuscle FatiguePeristalsisVigabatrinGastrointestinal MotilityTracheaDose-Response Relationship, DrugNorepinephrineManometryAtropineNifedipineUrinary BladderMusclesMuscle TonusRabbitsCalcium Channel BlockersTime FactorsIleumVasodilator AgentsEsophagusPhenylephrineFacial Nerve DiseasesDogsSerotoninrho-Associated KinasesVas DeferensBasilar ArteryAorta, ThoracicMotor NeuronsCarbacholOxytocicsRats, Sprague-DawleyTorqueHistamineNeuromuscular AgentsParasympatholyticsRats, Wistar15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidVerapamilMyosin Light ChainsCoronary VesselsMuscle SpasticityPotassiumCaffeineMyometriumMesenteric ArteriesArteriesPressureMuscle Fibers, SkeletalMyosinsIndomethacinEnzyme InhibitorsEndothelin-1ReflexBotulinum Toxins, Type ADiltiazemNitroglycerinCatsAdrenergic alpha-AgonistsFacial NerveMyographyHeartTetrodotoxinAdenosine TriphosphateBiomechanical PhenomenaAction PotentialsMyocardiumEndothelium, VascularVolitionAngina PectorisCoronary AngiographyStiff-Person SyndromePrazosinVasodilationEndothelins