Myocardial ContractionMyocardiumMuscle ContractionVentricular FunctionHeartHeart VentriclesSystoleVentricular Function, LeftCoronary CirculationDogsMyocytes, CardiacEchocardiographyVentricular Dysfunction, LeftCalciumIsometric ContractionUterine ContractionMyocardial StunningMuscle, SmoothElectric StimulationMyocardial IschemiaGuinea PigsMuscle, SkeletalIsotonic ContractionVasoconstrictionMyocardial InfarctionTime FactorsMyocardial Reperfusion InjuryRabbitsMuscle, Smooth, VascularRats, WistarMuscle RelaxationRats, Sprague-DawleyDose-Response Relationship, DrugMuscle FatigueElectromyographyCardiotonic AgentsPotassium ChlorideNorepinephrineCoronary VesselsGastrointestinal MotilityVasoconstrictor AgentsMyocardial ReperfusionSwineMusclesAcetylcholineTracheaCardiomyopathiesHeart AtriaPhenylephrineHemodynamicsPeristalsisVentricular RemodelingMyofibrilsUrinary BladderPericardiumMyosin Light ChainsAtropineNifedipineMyosinsAction PotentialsTissue SurvivalAorta, ThoracicDisease Models, AnimalCardiomegalyMuscle TonusPerfusionCarbacholCalcium Channel BlockersSarcomeresVerapamilVas DeferensSarcoplasmic ReticulumIleumAdenosine Triphosphate