Cardiovascular Physiological PhenomenaCardiovascular SystemCardiovascular Physiological ProcessesHeart RateBlood PressureHemodynamicsTelemetryCardiac OutputBaroreflexAutonomic Nervous SystemHeartElasmobranchiiVascular ResistanceHeart Function TestsSympathetic Nervous SystemRitodrineCardiovascular DiseasesIsosorbideAutonomic PathwaysHeart Rate, FetalMyocardial ContractionRats, Sprague-DawleyTocolytic AgentsSubfornical OrganHypertensionMyocardiumStroke VolumeRegional Blood FlowHypotensionParasympathetic Nervous SystemSolitary NucleusBody TemperaturePhysiologyTachycardiaNitric OxideOxygen ConsumptionArterial PressureCardiography, ImpedanceMedulla OblongataParaventricular Hypothalamic NucleusTime FactorsValsalva ManeuverCatecholaminesRespirationDose-Response Relationship, DrugVentricular Function, LeftKidneyExerciseAortaEpinephrineBlood Flow VelocityRenin-Angiotensin SystemEndothelium, VascularAngiotensin INorepinephrinePregnancyRats, WistarAorta, ThoracicVasodilationEchocardiographyNitric Oxide SynthaseRats, Inbred WKYPressoreceptorsNitroprussideCircadian RhythmMyocytes, CardiacPhysical ExertionAnoxiaRats, Inbred SHRAngiotensin IIReceptors, G-Protein-CoupledPhysical EnduranceDogsCompliancePeptidyl-Dipeptidase AOxygenMicroinjectionsAdrenomedullinArginine VasopressinMice, KnockoutExercise TestPhenylephrineSheepMice, Inbred C57BLLeptinVasoconstrictionPulmonary CirculationAgingVasodilator AgentsElectrocardiographyVasoconstrictor AgentsSignal TransductionAnesthesiaDisease Models, AnimalBlood VesselsInjections, IntraventricularPhysical Conditioning, AnimalNitric Oxide Synthase Type IIICardiotonic AgentsBlood Volume