SpasmMuscle RelaxationSpasms, InfantileHemifacial SpasmMuscle, SmoothCoronary VasospasmMusclesMuscle ContractionEsophageal Spasm, DiffuseRelaxation TherapyMuscle, Smooth, VascularMuscle, SkeletalMuscle ProteinsErgonovineFacial MusclesAngina Pectoris, VariantMuscle Fibers, SkeletalNitric OxideAcetylcholineVasodilationMuscle DevelopmentTracheaMuscle FatigueVasodilator AgentsCyclic GMPDeuteroporphyrinsHSP20 Heat-Shock ProteinsNeuromuscular BlockadeElectric StimulationNitroprussideElectromyographyMuscle TonusNeuromuscular Nondepolarizing AgentsBlepharospasmRelaxationMuscle Fibers, Fast-TwitchIsometric ContractionMuscle DenervationNitroglycerinPenisGuinea PigsEndothelium, VascularDose-Response Relationship, DrugMuscle Fibers, Slow-TwitchRabbitsCalciumMuscle Relaxants, CentralMyocytes, Smooth MuscleNeck MusclesOculomotor MusclesVigabatrinOpossumsMitochondria, MuscleTime FactorsNitroarginineAorta, ThoracicCyclic GMP-Dependent Protein KinasesNitric Oxide DonorsBiological FactorsIsoproterenolOxadiazolesRats, Sprague-DawleyVasoconstrictionGuanylate CyclasePapillary MusclesAnal CanalNitric Oxide SynthaseMuscle, StriatedBromcresol Greengamma-CyclodextrinsAndrostanolsVasoactive Intestinal PeptidePenile ErectionMuscle SpindlesAortaRespiratory MusclesMuscle SpasticityMasticatory MusclesMuscle WeaknessEnzyme InhibitorsRats, WistarAtracuriumNG-Nitroarginine Methyl EsterDogsNeuromuscular JunctionFacial Nerve DiseasesCoronary VesselsMyotonia CongenitaAbdominal MusclesAdrenergic beta-AgonistsMuscle CellsVasoconstrictor AgentsMyocardial ContractionPhenylephrineQuadriceps MuscleBiomechanical PhenomenaNorepinephrineVecuronium BromideNeuromuscular AgentsMasseter Muscle