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-TwitchRabbitsGuinea PigsEndothelium, VascularCalciumDose-Response Relationship, DrugMyocytes, Smooth MuscleAngina Pectoris, VariantOpossumsMitochondria, MuscleNeck MusclesNitroglycerinNitroarginineOculomotor MusclesAorta, ThoracicMuscle Relaxants, CentralCyclic GMP-Dependent Protein KinasesNitric Oxide DonorsBiological FactorsIsoproterenolTime FactorsOxadiazolesGuanylate CyclasePapillary MusclesAnal CanalRats, Sprague-DawleyMuscle, StriatedBromcresol Greengamma-CyclodextrinsAndrostanolsNitric Oxide SynthaseVasoactive Intestinal PeptidePenile ErectionMuscle SpindlesAortaRespiratory MusclesMuscle WeaknessRats, WistarVasoconstrictionAtracuriumNG-Nitroarginine Methyl EsterNeuromuscular JunctionEnzyme InhibitorsDogsMyotonia CongenitaAbdominal MusclesMuscle CellsMasticatory MusclesBiomechanical PhenomenaMyocardial ContractionAdrenergic beta-AgonistsPhenylephrineQuadriceps MuscleVecuronium BromideMasseter MuscleParvalbuminsMyosin-Light-Chain PhosphataseNucleotides, CyclicMembrane PotentialsNorepinephrinePurinonesArginineQuinoxalines