FMRFamideHeartMyocardiumMyocytes, CardiacTrypanosoma cruziMusclesCells, CulturedMuscle, SmoothMuscle ProteinsMuscle, SkeletalMyocytes, Smooth MuscleHeart RateMuscle Fibers, SkeletalMuscle ContractionMuscle DevelopmentPapillary MusclesMuscle, Smooth, VascularMuscle CellsMyocardial ContractionHeart FailureMitochondria, MuscleCalciumHeart DiseasesMyofibrilsAortaMuscle Fibers, Fast-TwitchMuscle FatigueMuscle DenervationRabbitsMuscle Fibers, Slow-TwitchTime FactorsRats, Sprague-DawleyRNA, MessengerHeart TransplantationMuscle RelaxationHeart Defects, CongenitalCardiomyopathiesMuscle, StriatedNeck MusclesOculomotor MusclesCardiomyopathy, DilatedRats, WistarMembrane PotentialsHeart AtriaMuscle SpindlesRespiratory MusclesSignal TransductionGuinea PigsMuscle WeaknessFetal HeartCreatine KinaseGene Expression RegulationElectric StimulationDogsKineticsActinsQuadriceps MuscleAbdominal MusclesDose-Response Relationship, DrugMolecular Sequence DataCell DifferentiationSarcoplasmic ReticulumSarcolemmaSarcomeresMicroscopy, ElectronIsometric ContractionAction PotentialsMasseter MuscleHeart ValvesImmunohistochemistryGene ExpressionMuscular AtrophyFacial MusclesPlatelet-Derived Growth FactorMyosin Heavy ChainsMasticatory MusclesAnuraCell DivisionRegenerationCattleAdenosine TriphosphatePhosphorylationCatsIntercostal MusclesPerfusionPotassiumElectromyographySatellite Cells, Skeletal MuscleAorta, ThoracicMice, Inbred C57BLMyocarditisDisease Models, AnimalBase SequenceOrgan SpecificityModels, BiologicalMyoblastsHeart VentriclesCardiomegalyMuscular DiseasesIsoproterenol