Muscle ContractionMyosinsMusclesMuscle, SkeletalPhosphocreatineElectromyographyMyosin Heavy ChainsElectric StimulationMyosin Type IIMyosin Light ChainsAdenosine TriphosphateMyosin SubfragmentsModels, BiologicalIsometric ContractionMyosin Type VUterine ContractionMuscle, SmoothNonmuscle Myosin Type IIAMyocardial ContractionMyosin Type ICardiac MyosinsNonmuscle Myosin Type IIBActinsMyosin-Light-Chain KinaseActomyosinRabbitsCalciumSmooth Muscle MyosinsMyosin Type IIIMyosin-Light-Chain PhosphataseHeterocyclic Compounds with 4 or More RingsIsotonic ContractionVasoconstrictionGizzardSkeletal Muscle MyosinsActin CytoskeletonMuscle, Smooth, VascularAdenosine TriphosphatasesGuinea PigsCa(2+) Mg(2+)-ATPaserho-Associated KinasesMuscle RelaxationPotassium ChlorideMolecular Motor ProteinsVentricular MyosinsMyofibrilsMuscle Fibers, SkeletalChickensPhosphorylationMuscle FatigueTropomyosinTracheaSarcomeresMyocardiumKineticsDose-Response Relationship, DrugMuscle ProteinsDictyosteliumGastrointestinal MotilityUrinary BladderVasoconstrictor AgentsTime FactorsTurkeysCytoskeletonAdenosine DiphosphatePeristalsisAcetylcholineNorepinephrineProtein IsoformsPhenylephrineMuscle TonusDogsRats, WistarCalmodulinCalmodulin-Binding ProteinsBiomechanical PhenomenaMolluscaCarbacholMolecular Sequence DataAtropineAorta, ThoracicRats, Sprague-DawleyAmino Acid SequenceProtein BindingAzepinesIleumNifedipineVas DeferensMicroscopy, ElectronMuscle Fibers, Fast-TwitchEnzyme InhibitorsCells, CulturedMuscle Fibers, Slow-Twitch15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidHeartPeptide FragmentsAmoebaAmidesTorqueElectrophoresis, Polyacrylamide Gel