Pulmonary CirculationHypercapniaAnoxiaAltitude SicknessPulmonary ArteryVascular ResistanceHypertension, PulmonaryVasoconstrictionLungOxygenCell HypoxiaBlood PressureCardiac OutputAcetylcholineDogsCarbon DioxideHemodynamicsRespirationChemoreceptor CellsHypocapniaVasodilationPartial PressureCerebrovascular CirculationHypoxia, BrainPulmonary VentilationAcidosis, RespiratoryRegional Blood FlowFetal HypoxiaBlood Gas AnalysisBlood VesselsRespiratory MechanicsVasomotor SystemPia MaterVasodilator AgentsVasoconstrictor AgentsForearmApneaHeart RateAcidosisRats, Sprague-DawleyHypoxia-Inducible Factor 1, alpha SubunitBlood Flow VelocityArteriolesTidal VolumeNitric OxideEndothelium, VascularHyperoxiaNorepinephrineReflexTime FactorsAcid-Base EquilibriumNitroprussideLaser-Doppler FlowmetryPlethysmographyCerebral ArteriesArteriesOxygen ConsumptionCarotid BodySympathetic Nervous SystemPhenylephrineAnimals, NewbornHydrogen-Ion ConcentrationMuscle, Smooth, VascularRats, WistarCatsDose-Response Relationship, DrugHypoxia-Inducible Factor 1AsphyxiaRenal CirculationHyperventilationPhrenic NerveCarotid SinusPerfusionAnesthesiaCoronary VesselsHyperemiaNG-Nitroarginine Methyl EsterAngiotensin IIRenal ArterySodium CyanidePlethysmography, Whole BodyDiaphragmNitric Oxide SynthaseBrainVagotomyMesenteric ArteriesHypoventilationRespiratory Physiological PhenomenaAltitudeHypotensionPressoreceptorsIndomethacinNitroarginineNitric Oxide Synthase Type IIISheepDisease Models, AnimalSwineRespiratory MusclesAdaptation, PhysiologicalRabbits