Muscle RelaxationSpasmSpasms, InfantileMuscle, SmoothMusclesHemifacial SpasmMuscle ContractionRelaxation TherapyMuscle, Smooth, VascularMuscle, SkeletalMuscle ProteinsCoronary VasospasmMuscle Fibers, SkeletalEsophageal Spasm, DiffuseNitric OxideVasodilationMuscle DevelopmentMuscle FatigueTracheaAcetylcholineCyclic GMPDeuteroporphyrinsFacial MusclesVasodilator AgentsHSP20 Heat-Shock ProteinsNeuromuscular BlockadeNitroprussideElectric StimulationNeuromuscular Nondepolarizing AgentsErgonovineRelaxationMuscle Fibers, Fast-TwitchMuscle TonusIsometric ContractionMuscle DenervationPenisElectromyographyMuscle Fibers, Slow-TwitchGuinea PigsRabbitsEndothelium, VascularCalciumDose-Response Relationship, DrugMyocytes, Smooth MuscleAngina Pectoris, VariantOpossumsMitochondria, MuscleNeck MusclesNitroglycerinNitroarginineOculomotor MusclesAorta, ThoracicMuscle Relaxants, CentralCyclic GMP-Dependent Protein KinasesNitric Oxide DonorsBiological FactorsIsoproterenolOxadiazolesGuanylate CyclasePapillary MusclesAnal CanalTime FactorsRats, Sprague-DawleyMuscle, StriatedBromcresol Greengamma-CyclodextrinsAndrostanolsVasoactive Intestinal PeptideNitric Oxide SynthasePenile ErectionMuscle SpindlesAortaRespiratory MusclesMuscle WeaknessVasoconstrictionRats, WistarAtracuriumNG-Nitroarginine Methyl EsterNeuromuscular JunctionEnzyme InhibitorsMyotonia CongenitaDogsAbdominal MusclesMuscle CellsMasticatory MusclesMyocardial ContractionAdrenergic beta-AgonistsPhenylephrineQuadriceps MuscleBiomechanical PhenomenaVecuronium BromideMasseter MuscleParvalbuminsMyosin-Light-Chain PhosphataseNucleotides, CyclicNorepinephrineMembrane PotentialsPurinonesArginineQuinoxalines