SpasmMuscle RelaxationSpasms, InfantileMuscle SpasticityMusclesNeck MusclesHemifacial SpasmMuscle, SmoothCervical AtlasOccipital BoneMuscle ContractionMuscle, Smooth, VascularNeuromuscular AgentsMuscle, SkeletalMuscle ProteinsCoronary VasospasmSpinal Cord InjuriesElectromyographyMuscle Fibers, SkeletalBotulinum Toxins, Type AEsophageal Spasm, DiffuseMotor NeuronsRelaxation TherapyMuscle DevelopmentMuscle FatigueFacial MusclesErgonovineMuscle Fibers, Fast-TwitchMuscle DenervationMuscle Fibers, Slow-TwitchAngina Pectoris, VariantMyocytes, Smooth MuscleAcetylcholineMitochondria, MuscleNitric OxideVasodilationOculomotor MusclesTracheaIsometric ContractionMuscle, StriatedElectric StimulationPapillary MusclesMuscle SpindlesVasodilator AgentsRespiratory MusclesCyclic GMPMuscle WeaknessRabbitsCalciumDeuteroporphyrinsAbdominal MusclesMasticatory MusclesMuscle CellsQuadriceps MuscleGuinea PigsHSP20 Heat-Shock ProteinsNeuromuscular BlockadeNitroprussideMasseter MuscleTime FactorsDose-Response Relationship, DrugMuscle Relaxants, CentralNeuromuscular Nondepolarizing AgentsEndothelium, VascularMuscle TonusBlepharospasmPenisIntercostal MusclesRelaxationRats, Sprague-DawleyNitroglycerinMuscular AtrophySatellite Cells, Skeletal MuscleNeuromuscular JunctionAorta, ThoracicRats, WistarAortaOpossumsBiomechanical PhenomenaPectoralis MusclesVasoconstrictionIsoproterenolNitroarginineVigabatrinCyclic GMP-Dependent Protein KinasesNitric Oxide DonorsMuscular DiseasesTemporal MuscleOxadiazolesBiological FactorsNitric Oxide SynthaseMyofibrilsDogsAnal CanalGuanylate CyclasePsoas MusclesEnzyme InhibitorsVasoactive Intestinal PeptideAndrostanolsPenile Erection