Muscle ContractionIsometric ContractionUterine ContractionMyocardial ContractionMuscle, SmoothElectric StimulationMuscle, SkeletalIsotonic ContractionVasoconstrictionCalciumGuinea PigsMuscle, Smooth, VascularMuscle RelaxationMuscle FatigueElectromyographyPotassium ChlorideGastrointestinal MotilityTracheaVasoconstrictor AgentsPeristalsisUrinary BladderMusclesNorepinephrineDose-Response Relationship, DrugAcetylcholineRabbitsAtropinePhenylephrineVas DeferensIleumNifedipineAorta, ThoracicMuscle TonusCarbacholTorqueRats, WistarDogs15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidMyosin Light Chainsrho-Associated KinasesTime FactorsRats, Sprague-DawleyMotor NeuronsSerotoninCaffeineMyometriumCalcium Channel BlockersMesenteric ArteriesMuscle Fibers, SkeletalMyosinsPotassiumVerapamilHistamineAdrenergic alpha-AgonistsMyographyManometryIndomethacinEnzyme InhibitorsBiomechanical PhenomenaArteriesCatsVolitionEsophagusPrazosinAdenosine TriphosphateEndothelinsActomyosinAction PotentialsPressureParasympatholyticsMyocardiumNeurokinin AEndothelin-1HeartExcitation Contraction CouplingBasilar ArteryReflexRecruitment, NeurophysiologicalElbowTetrodotoxinIndolesAdrenergic alpha-AntagonistsRyanodineMyofibrilsMuscarinic AntagonistsReceptors, Adrenergic, alpha-1Papillary MusclesAortaDinoprostThromboxane A2Membrane PotentialsGelsSarcomeresActinsIsoproterenolColonMyosin-Light-Chain KinaseSarcoplasmic ReticulumVasodilator AgentsCalcium Signaling