Muscle RelaxationMuscle, SmoothMusclesMuscle ContractionRelaxation TherapyMuscle, Smooth, VascularMuscle, SkeletalMuscle ProteinsMuscle Fibers, SkeletalMuscle DevelopmentMyocardiumNitric OxideVasodilationMuscle FatigueHeartTracheaMyocardial ContractionCalciumCyclic GMPPapillary MusclesMyocytes, CardiacRabbitsDeuteroporphyrinsAcetylcholineHSP20 Heat-Shock ProteinsElectric StimulationIsometric ContractionNeuromuscular BlockadeGuinea PigsMuscle Fibers, Fast-TwitchNitroprussideVasodilator AgentsNeuromuscular Nondepolarizing AgentsDose-Response Relationship, DrugMuscle Fibers, Slow-TwitchTime FactorsRelaxationIsoproterenolMuscle DenervationMuscle TonusPenisRats, Sprague-DawleyEndothelium, VascularMyocytes, Smooth MuscleMitochondria, MuscleElectromyographyDogsOpossumsRats, WistarMyofibrilsAorta, ThoracicNitroarginineCyclic GMP-Dependent Protein KinasesNitric Oxide DonorsBiological FactorsOxadiazolesGuanylate CyclaseAortaNeck MusclesSarcomeresOculomotor MusclesAnal CanalNitric Oxide SynthaseMuscle, StriatedBromcresol GreenMuscle CellsSerumAndrostanolsgamma-CyclodextrinsVasoactive Intestinal PeptidePenile ErectionMuscle SpindlesEnzyme InhibitorsCardiac OutputRespiratory MusclesMembrane PotentialsAdrenergic beta-AgonistsMuscle Relaxants, CentralPhenylephrineNeuromuscular JunctionNG-Nitroarginine Methyl EsterNitroglycerinMuscle WeaknessBiomechanical PhenomenaAtracuriumCells, CulturedHeart VentriclesKineticsRNA, MessengerNorepinephrineMyotonia CongenitaAbdominal MusclesSarcoplasmic Reticulum Calcium-Transporting ATPasesQuadriceps MuscleVecuronium BromideCatsArginineParvalbuminsMasseter MuscleVasoconstriction