Muscle, SkeletalMuscle RelaxationMuscle, SmoothMuscle, Smooth, VascularMusclesMyocytes, Smooth MuscleMuscle ContractionMuscle ProteinsMuscle Fibers, SkeletalMuscle DevelopmentRelaxation TherapyTracheaMuscle FatigueAortaCells, CulturedCalciumRabbitsNitric OxideMuscle Fibers, Fast-TwitchMuscle DenervationMuscle Fibers, Slow-TwitchIsometric ContractionGuinea PigsAcetylcholineCyclic GMPMitochondria, MuscleRats, Sprague-DawleyAorta, ThoracicVasodilationElectric StimulationDose-Response Relationship, DrugEndothelium, VascularOculomotor MusclesMuscle, StriatedNeck MusclesTime FactorsVasodilator AgentsMuscle TonusPapillary MusclesMuscle SpindlesElectromyographyRespiratory MusclesRNA, MessengerPenisRats, WistarSmooth Muscle MyosinsMuscle CellsMuscle WeaknessHSP20 Heat-Shock ProteinsDeuteroporphyrinsEnzyme InhibitorsActinsVasoconstrictionMembrane PotentialsSignal TransductionNitroprussideAbdominal MusclesDogsQuadriceps MuscleCyclic GMP-Dependent Protein KinasesPhosphorylationNeuromuscular BlockadeNitric Oxide DonorsIsoproterenolMasseter MuscleArteriesNeuromuscular Nondepolarizing AgentsImmunohistochemistryFacial MusclesNitric Oxide SynthaseNitroarginineMasticatory MusclesNeuromuscular JunctionKineticsBiological FactorsRelaxationMyosin-Light-Chain PhosphataseGuanylate CyclaseIntercostal MusclesPhenylephrineBiomechanical PhenomenaMesenteric ArteriesOxadiazolesMuscular AtrophyMyosin Heavy ChainsPotassium ChlorideOpossumsPulmonary ArteryNorepinephrineMuscle Relaxants, CentralVasoconstrictor AgentsMolecular Sequence DataCattleSatellite Cells, Skeletal MuscleMyofibrilsAnal CanalMice, Inbred C57BLPectoralis MusclesVasoactive Intestinal PeptidePenile Erection