Muscle Fibers, Fast-TwitchMusclesMuscle ContractionMuscle Fibers, Slow-TwitchMuscle Fibers, SkeletalArsenazo IIISnakesRana temporariaMuscle, SkeletalMuscle DenervationHeptaminolMuscle ProteinsSarcoplasmic ReticulumAnuraRana pipiensCalciumCalcium-Transporting ATPasesHypertonic SolutionsRabbitsMembrane PotentialsMyofibrilsMuscle DevelopmentMuscle, SmoothNeuromuscular JunctionNerve FibersElectric StimulationIsometric ContractionMuscle, Smooth, VascularMotor NeuronsMuscle FatigueTime FactorsMyosin Heavy ChainsDiaphragmMotor EndplateAction PotentialsMitochondria, MuscleSarcomeresMuscle SpindlesPsoas MusclesNeural ConductionDietary FiberOculomotor MusclesMuscle RelaxationElectromyographyMuscular AtrophyCatsMuscular DiseasesPapillary MusclesMuscle, StriatedMuscle WeaknessHindlimbThoracicaQuadriceps MuscleRespiratory MusclesMasseter MuscleNeck MusclesElectrophysiologyMuscular Dystrophy, AnimalMyocytes, Smooth MuscleMyosinsBiomechanical PhenomenaTetrodotoxinSatellite Cells, Skeletal MuscleMasticatory MusclesAbdominal MusclesMineral FibersPotassiumCaffeineIntercostal MusclesHistocytochemistryMice, Inbred mdxSarcolemmaRanidaeMuscle CellsRana esculentaKineticsFacial MusclesRats, WistarTubocurarineModels, BiologicalMicroscopy, ElectronCotton FiberPectoralis MusclesPurkinje FibersDystrophinRegenerationNADH Tetrazolium ReductaseCells, CulturedMyocardial ContractionRats, Sprague-DawleyReceptors, CholinergicMyoblastsSkeletal Muscle MyosinsTendonsNeuromuscular Blocking AgentsMyocardiumActinsTetanyStress, MechanicalGlycogen