Excitation Contraction CouplingMuscle ContractionIsometric ContractionMuscle, SmoothMusclesMuscle, SkeletalUterine ContractionMuscle, Smooth, VascularMyocardial ContractionMuscle ProteinsElectric StimulationMuscle Fibers, SkeletalMuscle FatigueCalciumMuscle RelaxationElectromyographyGuinea PigsMuscle DevelopmentVasoconstrictionRabbitsTracheaMuscle Fibers, Fast-TwitchIsotonic ContractionMuscle SpindlesMotor NeuronsMuscle Fibers, Slow-TwitchTime FactorsPotassium ChloridePeristalsisMyocytes, Smooth MuscleAcetylcholineRats, Sprague-DawleyAction PotentialsDose-Response Relationship, DrugGastrointestinal MotilityRats, WistarPapillary MusclesCatsMyosinsMyosin Light ChainsMuscle DenervationBiomechanical PhenomenaMyofibrilsUrinary BladderVasoconstrictor AgentsCarbacholMitochondria, MuscleNorepinephrineMuscle, StriatedTorqueHindlimbMuscle TonusNeck MusclesAtropineDogsActinsSarcomeresPhenylephrinerho-Associated KinasesIleumReflexTropomyosinOculomotor MusclesQuadriceps MuscleMembrane PotentialsTroponin CAdenosine TriphosphateRespiratory MusclesModels, BiologicalCaffeineAorta, ThoracicAbdominal MusclesPotassiumElectrophysiologyMuscle WeaknessActomyosinMyocardiumDiaphragmSerotoninCells, CulturedNifedipineNeuromuscular JunctionMuscle CellsFacial MusclesPhysical ExertionKineticsEnzyme InhibitorsCalcium Channel BlockersPressureMyography15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidVas DeferensCalcium SignalingMyosin-Light-Chain KinaseHeartHistamineMasticatory MusclesCholinergic AgonistsStress, MechanicalPhosphorylation