MusclesMyocytes, CardiacMuscle, SmoothMuscle ProteinsMyocytes, Smooth MuscleMyocardiumMuscle, SkeletalHeartMuscle Fibers, SkeletalCells, CulturedMuscle CellsMuscle ContractionMuscle DevelopmentMuscle, Smooth, VascularCalciumCardiac OutputArrhythmias, CardiacMyocardial ContractionRats, Sprague-DawleyTime FactorsMyoblasts, CardiacAortaHeart VentriclesMuscle Fibers, Fast-TwitchMuscle DenervationMuscle FatigueMuscle Fibers, Slow-TwitchCardiomegalyRNA, MessengerMitochondria, MuscleMyofibrilsCardiac Surgical ProceduresRabbitsSignal TransductionDeath, Sudden, CardiacRats, WistarMembrane PotentialsMuscle RelaxationPapillary MusclesModels, CardiovascularMuscle, StriatedGuinea PigsAnimals, NewbornCell DifferentiationNeck MusclesOculomotor MusclesSarcolemmaGene Expression RegulationSarcomeresMuscle SpindlesHeart DiseasesAction PotentialsRespiratory MusclesMuscle WeaknessDogsCardiomyopathiesVentricular FunctionElectric StimulationActinsCardiac Pacing, ArtificialDose-Response Relationship, DrugElectrophysiologyImmunohistochemistryMyosin Heavy ChainsKineticsPhosphorylationMice, Inbred C57BLCell DivisionQuadriceps MuscleCell LineAbdominal MusclesDisease Models, AnimalCalcium SignalingGene ExpressionChick EmbryoBlotting, WesternAngiotensin IIIsometric ContractionAorta, ThoracicHeart FailureMitochondria, HeartMice, KnockoutCardiac TamponadeMasseter MuscleEnzyme InhibitorsMice, TransgenicModels, BiologicalMuscular AtrophyPlatelet-Derived Growth FactorFacial MusclesPotassiumMasticatory MusclesIntercostal MusclesPotassium ChannelsSatellite Cells, Skeletal MuscleMolecular Sequence DataCoronary VesselsElectromyographyHeart Conduction SystemHeart Rate