Muscle ContractionMusclesMuscle, SmoothMuscle, SkeletalIsometric ContractionMuscle ProteinsMuscle, Smooth, VascularMuscle Fibers, SkeletalMuscle FatigueElectric StimulationUterine ContractionMuscle DevelopmentMyocardial ContractionMuscle RelaxationCalciumElectromyographyMuscle Fibers, Fast-TwitchMuscle Fibers, Slow-TwitchRabbitsMyocytes, Smooth MuscleMuscle SpindlesTracheaMuscle DenervationGuinea PigsMuscle, StriatedMitochondria, MuscleVasoconstrictionPapillary MusclesNeck MusclesMyofibrilsMyosinsOculomotor MusclesPeristalsisMotor NeuronsTime FactorsBiomechanical PhenomenaPotassium ChlorideMyosin Light ChainsHindlimbTropomyosinRespiratory MusclesIsotonic ContractionMuscle WeaknessAbdominal MusclesAcetylcholineActinsRats, Sprague-DawleyQuadriceps MuscleSarcomeresRats, WistarTroponin CDose-Response Relationship, DrugMuscle CellsFacial MusclesGastrointestinal MotilityTorqueUrinary BladderCarbacholMasticatory Musclesrho-Associated KinasesMuscle TonusDiaphragmNeuromuscular JunctionVasoconstrictor AgentsDogsCells, CulturedModels, BiologicalCatsPhysical ExertionActomyosinPhenylephrineAdenosine TriphosphatePsoas MusclesTroponinIleumReflexNorepinephrineMasseter MusclePhosphorylationMuscular DiseasesIntercostal MusclesCaffeineMyocardiumMyosin-Light-Chain KinaseAtropineAorta, ThoracicStress, MechanicalKineticsMyographySignal TransductionPotassiumMuscular AtrophyActin CytoskeletonEnzyme InhibitorsMyosin Heavy ChainsCholinergic AgonistsCalcium SignalingAortaMyosin-Light-Chain PhosphataseSarcoplasmic Reticulum