Muscle ContractionNeuronsMusclesMuscle, SmoothMuscle, SkeletalIsometric ContractionMuscle ProteinsMotor NeuronsMuscle, Smooth, VascularNeurons, AfferentMuscle Fibers, SkeletalElectric StimulationMuscle FatigueCalciumUterine ContractionMuscle DevelopmentMyocardial ContractionMuscle RelaxationElectromyographyAction PotentialsMuscle Fibers, Fast-TwitchMuscle Fibers, Slow-TwitchGuinea PigsRabbitsTime FactorsMuscle SpindlesCells, CulturedMyocytes, Smooth MuscleRats, WistarTracheaMuscle DenervationRats, Sprague-DawleyElectrophysiologyCatsMuscle, StriatedMitochondria, MuscleVasoconstrictionMembrane PotentialsDose-Response Relationship, DrugNeck MusclesAcetylcholinePapillary MusclesPotassium ChlorideOculomotor MusclesMyofibrilsHindlimbMyosinsPeristalsisBiomechanical PhenomenaMyosin Light ChainsActinsRespiratory MusclesTropomyosinAbdominal MusclesIsotonic ContractionMuscle WeaknessSynaptic TransmissionPatch-Clamp TechniquesQuadriceps MuscleGastrointestinal MotilitySerotoninSarcomeresFacial MusclesTroponin CMuscle CellsCarbacholSignal TransductionSpinal CordModels, BiologicalNeuromuscular JunctionUrinary BladderDopaminergic NeuronsImmunohistochemistryReflexTetrodotoxinAxonsNorepinephrineTorqueMasticatory MusclesDiaphragmPotassiumAdenosine TriphosphateNeuropeptidesrho-Associated KinasesMuscle TonusMice, Inbred C57BLPhosphorylationCalcium SignalingSynapsesIleumDogsEnzyme InhibitorsVasoconstrictor AgentsPhenylephrineAtropineCalcium Channel BlockersPhysical ExertionMasseter MuscleAnimals, NewbornKinetics