Muscle ContractionMusclesMuscle, SmoothMuscle, SkeletalIsometric ContractionMuscle, Smooth, VascularMuscle ProteinsMuscle Fibers, SkeletalCalciumMembrane PotentialsElectric StimulationMuscle FatigueMyocardial ContractionUterine ContractionMuscle DevelopmentMuscle RelaxationGuinea PigsPotassiumElectromyographyAction PotentialsMuscle Fibers, Fast-TwitchRabbitsElectrophysiologyPotassium ChlorideMuscle Fibers, Slow-TwitchMyocytes, Smooth MuscleTime FactorsMuscle SpindlesRats, Sprague-DawleyTracheaMuscle DenervationMotor NeuronsVasoconstrictionAcetylcholinePapillary MusclesRats, WistarTetrodotoxinMitochondria, MuscleMuscle, StriatedDose-Response Relationship, DrugMyofibrilsCarbacholCells, CulturedNeck MusclesCalcium Channel BlockersMyosinsPatch-Clamp TechniquesNeuromuscular JunctionPeristalsisOculomotor MusclesHindlimbMyosin Light ChainsBiomechanical PhenomenaCalcium ChannelsCalcium SignalingCatsRespiratory MusclesCaffeineCortical Spreading DepressionActinsAdenosine TriphosphateTropomyosinKineticsMuscle CellsIsotonic ContractionNifedipineMuscle WeaknessAbdominal MusclesNorepinephrineQuadriceps MuscleUrinary BladderSarcomeresModels, BiologicalTroponin CMuscle TonusAtropineDogsGastrointestinal MotilityDiaphragmSodiumFacial MusclesVasoconstrictor AgentsNeuronsrho-Associated KinasesTorqueNeuromuscular Depolarizing AgentsIon ChannelsMyocardiumAnuraElectric ConductivityMasticatory MusclesPhenylephrineIleumEnzyme InhibitorsSerotoninSarcoplasmic ReticulumPotassium ChannelsPhosphorylationReflexCholinergic Agonists