Muscle RelaxationMusclesMuscle, SmoothMuscle, SkeletalMuscle ContractionMuscle, Smooth, VascularMuscle ProteinsRelaxation TherapyMuscle Fibers, SkeletalMuscle DevelopmentMuscle FatigueVasodilationNitric OxideMuscle Fibers, Fast-TwitchMuscle DenervationMuscle Fibers, Slow-TwitchRelaxationTracheaAcetylcholineMitochondria, MuscleMyocytes, Smooth MuscleRabbitsElectric StimulationCyclic GMPMuscle, StriatedVasodilator AgentsCalciumNitroprussideEndothelium, VascularIsometric ContractionNeck MusclesOculomotor MusclesPapillary MusclesDose-Response Relationship, DrugTime FactorsElectromyographySerumGuinea PigsMuscle SpindlesMuscle CellsRespiratory MusclesRats, Sprague-DawleyNitroargininePenisMuscle WeaknessAorta, ThoracicBiological FactorsRats, WistarDeuteroporphyrinsMuscular DiseasesHSP20 Heat-Shock ProteinsQuadriceps MuscleAortaAbdominal MusclesSatellite Cells, Skeletal MuscleNeuromuscular BlockadeMuscle TonusDogsMuscular AtrophyNeuromuscular Nondepolarizing AgentsMasseter MuscleOxadiazolesFacial MusclesIsoproterenolNitric Oxide DonorsNitric Oxide SynthaseMyofibrilsCells, CulturedEnzyme InhibitorsMasticatory MusclesBiomechanical PhenomenaNG-Nitroarginine Methyl EsterGuanylate CyclaseNeuromuscular JunctionIntercostal MusclesRNA, MessengerMyocardial ContractionMagnetic Resonance SpectroscopyVasoactive Intestinal PeptideOpossumsHindlimbCyclic GMP-Dependent Protein KinasesMyoblastsMyocardiumMembrane PotentialsAnal CanalPhenylephrineVasoconstrictionMyosin Heavy ChainsMuscle Relaxants, CentralKineticsCattleMesenteric ArteriesPenile ErectionPectoralis MusclesNitroglycerinArginineMice, Inbred C57BLNorepinephrineVasoconstrictor Agents