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 NeuronsBiomechanical PhenomenaPotassium ChlorideMyosin Light ChainsTropomyosinHindlimbTime FactorsRespiratory MusclesIsotonic ContractionMuscle WeaknessAbdominal MusclesAcetylcholineActinsQuadriceps MuscleRats, Sprague-DawleySarcomeresTroponin CRats, WistarMuscle CellsFacial MusclesDose-Response Relationship, DrugGastrointestinal MotilityTorqueUrinary BladderCarbacholMasticatory Musclesrho-Associated KinasesMuscle TonusDiaphragmNeuromuscular JunctionVasoconstrictor AgentsDogsCatsPhysical ExertionActomyosinPhenylephrinePsoas MusclesTroponinModels, BiologicalAdenosine TriphosphateIleumReflexCells, CulturedMasseter MuscleNorepinephrineMuscular DiseasesIntercostal MusclesCaffeinePhosphorylationMyosin-Light-Chain KinaseAtropineMyocardiumAorta, ThoracicMyographyStress, MechanicalPotassiumMuscular AtrophyActin CytoskeletonEnzyme InhibitorsKineticsMyosin Heavy ChainsCholinergic AgonistsCalcium SignalingMyosin-Light-Chain PhosphataseAortaSignal TransductionSarcoplasmic Reticulum