Muscle ContractionKineticsIsometric ContractionUterine ContractionMyocardial ContractionMuscle, SmoothElectric StimulationCalciumMuscle, SkeletalIsotonic ContractionVasoconstrictionGuinea PigsMuscle, Smooth, VascularMuscle RelaxationMuscle FatigueElectromyographyTime FactorsPotassium ChlorideDose-Response Relationship, DrugRabbitsMusclesGastrointestinal MotilityTracheaVasoconstrictor AgentsNorepinephrineAcetylcholinePeristalsisUrinary BladderAtropineModels, BiologicalDogsNifedipinePhenylephrineRats, WistarIleumRats, Sprague-DawleyVas DeferensCarbacholPotassiumAorta, ThoracicMuscle TonusAdenosine TriphosphateMyosin Light ChainsTorqueMembrane Potentials15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidCalcium Channel Blockersrho-Associated KinasesMyosinsCaffeineMuscle Fibers, SkeletalSerotoninMotor NeuronsEnzyme InhibitorsMyocardiumMyometriumAction PotentialsVerapamilCells, CulturedMesenteric ArteriesBiomechanical PhenomenaHydrogen-Ion ConcentrationHistamineHeartActomyosinAdrenergic alpha-AgonistsCatsIndomethacinPressureMyographyElectrophysiologyArteriesTetrodotoxinManometryMyofibrilsTemperaturePrazosinEndothelinsVolitionEsophagusActinsSarcomeresParasympatholyticsExcitation Contraction CouplingCalcium SignalingIndolesEndothelin-1Recruitment, NeurophysiologicalNeurokinin AGelsPapillary MusclesBasilar ArteryReflexElbowRyanodineSarcoplasmic ReticulumStress, MechanicalMuscarinic AntagonistsHeart VentriclesVentricular Function