Muscle ContractionMusclesMuscle, SkeletalMuscle, SmoothNeuromuscular JunctionElectric StimulationElectromyographyMuscle ProteinsMuscle Fibers, Slow-TwitchTubocurarineMuscle Fibers, Fast-TwitchIsometric ContractionMuscle Fibers, SkeletalMuscle, Smooth, VascularMotor NeuronsSnakesMuscle DenervationRana temporariaArsenazo IIIMuscle DevelopmentCalciumMuscle FatigueMyofibrilsAnuraMuscle RelaxationHeptaminolRana pipiensRabbitsMyocardial ContractionMyocytes, Smooth MuscleTime FactorsMuscle SpindlesSarcoplasmic ReticulumPapillary MusclesMitochondria, MuscleCatsMembrane PotentialsMuscle, StriatedOculomotor MusclesNeck MusclesUterine ContractionRespiratory MusclesHypertonic SolutionsAction PotentialsNeural ConductionMuscle WeaknessDiaphragmMotor EndplateQuadriceps MuscleAbdominal MusclesGuinea PigsTetrodotoxinMuscle CellsHindlimbPotassiumMasticatory MusclesFacial MusclesCalcium-Transporting ATPasesBiomechanical PhenomenaTracheaMasseter MuscleElectrophysiologyIntercostal MusclesSarcomeresTorqueRats, Sprague-DawleyMuscular AtrophyRats, WistarMuscular DiseasesVasoconstrictionAcetylcholineActinsDose-Response Relationship, DrugPsoas MusclesPotassium ChlorideTropomyosinSatellite Cells, Skeletal MuscleCells, CulturedMyosinsMyocardiumCaffeinePhysical ExertionMyosin Heavy ChainsPectoralis MusclesPeristalsisTroponin CIsotonic ContractionMyosin Light ChainsModels, BiologicalDogsCarbacholAdenosine TriphosphateUrinary BladderIleumGlycogenKineticsMyographyReflexTroponinGastrointestinal Motility