Muscle ContractionContractsContract ServicesMusclesMuscle, SmoothMuscle, SkeletalIsometric ContractionMuscle ProteinsMuscle, Smooth, VascularMuscle Fibers, SkeletalMuscle FatigueElectric StimulationMyocardial ContractionMuscle RelaxationUterine ContractionMuscle DevelopmentCalciumElectromyographyMuscle Fibers, Fast-TwitchMuscle Fibers, Slow-TwitchRabbitsMyocytes, Smooth MuscleGuinea PigsMuscle SpindlesTracheaVasoconstrictionMuscle DenervationMuscle, StriatedMitochondria, MuscleMyofibrilsMyosinsPapillary MusclesNeck MusclesPotassium ChlorideBiomechanical PhenomenaTime FactorsMotor NeuronsActinsMyosin Light ChainsOculomotor MusclesPeristalsisAcetylcholineRats, Sprague-DawleyTropomyosinHindlimbRespiratory MusclesIsotonic ContractionMuscle WeaknessAbdominal MusclesDose-Response Relationship, DrugRats, WistarQuadriceps MuscleSarcomeresTroponin CMuscle TonusGastrointestinal MotilityUrinary BladderVasoconstrictor AgentsMuscle CellsFacial MusclesCarbacholTorqueDogsNeuromuscular JunctionActomyosinMasticatory MusclesCatsrho-Associated KinasesModels, BiologicalDiaphragmCells, CulturedNorepinephrinePhenylephrineIleumAdenosine TriphosphateReflexPhysical ExertionAtropinePsoas MusclesTroponinCaffeineMyocardiumMasseter MusclePhosphorylationMuscular DiseasesIntercostal MusclesActin CytoskeletonAorta, ThoracicPotassiumStress, MechanicalMyosin-Light-Chain KinaseSerotoninKineticsEnzyme InhibitorsAortaPressureHistamineMyographyNifedipineSignal Transduction