Muscle, SmoothMyocytes, CardiacMuscle, Smooth, VascularMyocytes, Smooth MuscleMyocardiumMusclesCells, CulturedMuscle ProteinsMuscle ContractionHeartCalciumHeart VentriclesMuscle, SkeletalRats, Sprague-DawleyMuscle Fibers, SkeletalMyocardial ContractionMuscle CellsGuinea PigsMuscle DevelopmentAortaCardiomegalyRabbitsAnimals, NewbornRats, WistarRNA, MessengerMembrane PotentialsTime FactorsSignal TransductionIsoproterenolCalcium SignalingTracheaCalcium Channels, L-TypeMuscle RelaxationCardiac OutputActinsPatch-Clamp TechniquesArrhythmias, CardiacSarcolemmaSarcoplasmic ReticulumPhosphorylationSmooth Muscle MyosinsDose-Response Relationship, DrugMyosin Heavy ChainsEnzyme InhibitorsDogsSodium-Calcium ExchangerSarcomeresPotassium ChannelsAction PotentialsGene Expression RegulationVentricular FunctionAdrenergic beta-AgonistsMuscle Fibers, Fast-TwitchPapillary MusclesCalcium ChannelsHypertrophyMuscle DenervationMuscle FatiguePhenylephrineElectric StimulationIsometric ContractionCaffeineMitochondria, MuscleAorta, ThoracicElectrophysiologyAngiotensin IIMuscle Fibers, Slow-TwitchImmunohistochemistryMyofibrilsMice, KnockoutKineticsEndothelin-1Ryanodine Receptor Calcium Release ChannelCardiac Surgical ProceduresCell SizeBlotting, WesternGene ExpressionMice, Inbred C57BLPotassiumHeart AtriaMyosinsDeath, Sudden, CardiacMice, TransgenicReceptors, Adrenergic, betaModels, CardiovascularDisease Models, AnimalEnzyme ActivationProtein Kinase CPulmonary ArteryCell DivisionMuscle, StriatedArteriesCardiomyopathiesStress, MechanicalMitochondria, HeartAdenosine TriphosphateCoronary VesselsEndothelium, VascularMolecular Sequence DataNitric Oxide