Muscle RelaxationBlood VesselsEndothelium, VascularBlood PressureMuscle, SmoothMusclesMuscle ContractionRelaxation TherapyMuscle, Smooth, VascularMuscle, SkeletalMuscle ProteinsMuscle Fibers, SkeletalNitric OxideVasodilationMuscle DevelopmentMuscle FatigueTracheaCyclic GMPDeuteroporphyrinsAcetylcholineHSP20 Heat-Shock ProteinsNeuromuscular BlockadeNitroprussideElectric StimulationNeuromuscular Nondepolarizing AgentsMuscle Fibers, Fast-TwitchRelaxationVasodilator AgentsIsometric ContractionMuscle DenervationPenisRabbitsCalciumMuscle Fibers, Slow-TwitchMuscle TonusDose-Response Relationship, DrugGuinea PigsElectromyographyMyocytes, Smooth MuscleMitochondria, MuscleOpossumsRats, Sprague-DawleyAorta, ThoracicTime FactorsNitroarginineIsoproterenolCyclic GMP-Dependent Protein KinasesNitric Oxide DonorsBiological FactorsOxadiazolesNeck MusclesPapillary MusclesOculomotor MusclesGuanylate CyclaseRats, WistarAnal CanalMuscle, StriatedVasoactive Intestinal PeptideBromcresol GreenAndrostanolsgamma-CyclodextrinsNitric Oxide SynthasePenile ErectionAortaMuscle SpindlesRespiratory MusclesMuscle Relaxants, CentralMuscle WeaknessEnzyme InhibitorsNG-Nitroarginine Methyl EsterNeuromuscular JunctionNitroglycerinAtracuriumDogsMyocardial ContractionMyotonia CongenitaMuscle CellsAbdominal MusclesBiomechanical PhenomenaPhenylephrineQuadriceps MuscleParvalbuminsMembrane PotentialsAdrenergic beta-AgonistsVecuronium BromideMasseter MuscleVasoconstrictionArginineMyosin-Light-Chain PhosphataseRNA, MessengerKineticsNucleotides, CyclicFacial MusclesPurinonesQuinoxalinesNorepinephrineMasticatory MusclesNeostigminePhosphodiesterase InhibitorsSignal Transduction