Muscle ContractionMusclesMuscle, SmoothMuscle, SkeletalIsometric ContractionMuscle ProteinsMuscle, Smooth, VascularMuscle Fibers, SkeletalBiochemistryMuscle FatigueElectric StimulationUterine ContractionMuscle DevelopmentMyocardial ContractionCalciumMuscle RelaxationElectromyographyMuscle Fibers, Fast-TwitchRabbitsMuscle Fibers, Slow-TwitchMyocytes, Smooth MuscleMuscle SpindlesGuinea PigsTracheaMuscle DenervationMuscle, StriatedMitochondria, MuscleVasoconstrictionMyosinsPapillary MusclesNeck MusclesTime FactorsMyofibrilsOculomotor MusclesBiomechanical PhenomenaPotassium ChloridePeristalsisMotor NeuronsTropomyosinActinsMyosin Light ChainsHindlimbRespiratory MusclesIsotonic ContractionRats, Sprague-DawleyMuscle WeaknessAbdominal MusclesAcetylcholineKineticsDose-Response Relationship, DrugQuadriceps MuscleRats, WistarSarcomeresTroponin CMuscle CellsFacial MusclesModels, BiologicalGastrointestinal MotilityTorqueAdenosine TriphosphateUrinary BladderCarbacholMasticatory MusclesDogsrho-Associated KinasesMuscle TonusDiaphragmNeuromuscular JunctionActomyosinTroponinVasoconstrictor AgentsCells, CulturedCatsPhysical ExertionMolecular Sequence DataPhenylephrinePsoas MusclesPhosphorylationIleumReflexMyocardiumMasseter MuscleNorepinephrineMyosin-Light-Chain KinaseMuscular DiseasesIntercostal MusclesCaffeineAtropineEnzyme InhibitorsSignal TransductionAmino Acid SequenceStress, MechanicalPotassiumAorta, ThoracicMyographyMuscular AtrophyActin CytoskeletonMyosin Heavy ChainsCholinergic AgonistsCalcium Signaling