Muscle RelaxationMyocardial ContractionMyocardiumMuscle, SmoothMusclesRelaxation TherapyMuscle ContractionMuscle, Smooth, VascularMuscle, SkeletalMuscle ProteinsVasodilationNitric OxideRelaxationMyocytes, CardiacMuscle Fibers, SkeletalAcetylcholineCyclic GMPTracheaVasodilator AgentsNitroprussideMuscle DevelopmentMuscle FatigueEndothelium, VascularSerumHeartRabbitsCalciumDose-Response Relationship, DrugElectric StimulationTime FactorsCardiac OutputNitroarginineDeuteroporphyrinsGuinea PigsBiological FactorsPenisAorta, ThoracicHSP20 Heat-Shock ProteinsMuscle TonusRats, Sprague-DawleyIsoproterenolNeuromuscular BlockadeRats, WistarDogsNeuromuscular Nondepolarizing AgentsOxadiazolesMuscle Fibers, Fast-TwitchNitric Oxide SynthaseNitric Oxide DonorsAortaGuanylate CyclaseIsometric ContractionNG-Nitroarginine Methyl EsterMuscle DenervationMuscle Fibers, Slow-TwitchPapillary MusclesEnzyme InhibitorsMyocytes, Smooth MuscleVasoactive Intestinal PeptideOpossumsPhenylephrineCyclic GMP-Dependent Protein KinasesElectromyographyArrhythmias, CardiacCardiac Surgical ProceduresMagnetic Resonance SpectroscopyNitroglycerinAnal CanalAdrenergic beta-AgonistsMitochondria, MuscleArgininePenile ErectionVasoconstrictionSerum AlbuminDeath, Sudden, CardiacMesenteric ArteriesNorepinephrineVasoconstrictor AgentsBlood PressureMembrane PotentialsNeck MusclesMuscle, StriatedMuscle CellsHeart RateBromcresol GreenOculomotor MusclesAndrostanolsCells, CulturedHeart VentriclesQuinoxalinesgamma-CyclodextrinsMuscle Relaxants, CentralGastric FundusMuscle SpindlesKineticsRespiratory MusclesHemodynamicsBiomechanical PhenomenaDiastoleCoronary Vessels