HypercapniaAnoxiaCell HypoxiaCarbon DioxideOxygenChronic DiseasePulmonary ArteryAltitudeChemoreceptor CellsHypertrophy, Right VentricularHypertension, PulmonaryFetal HypoxiaRespirationHypoxia, BrainCarotid BodyPulmonary VentilationAltitude SicknessPartial PressureHypoxia-Inducible Factor 1, alpha SubunitPulmonary CirculationAcidosis, RespiratoryHypocapniaAtmosphere Exposure ChambersRats, Sprague-DawleyVasoconstrictionAcclimatizationHematocritBlood Gas AnalysisLungRats, WistarHypoxia-Inducible Factor 1Respiratory MechanicsAcid-Base EquilibriumCerebrovascular CirculationAnimals, NewbornAdaptation, PhysiologicalPolycythemiaSheepOxygen ConsumptionApneaUterine ArteryVasodilationAcidosisBlood PressureCyanosisNitric OxideTidal VolumeTime FactorsHyperoxiaArteriesMuscle, Smooth, VascularDisease Models, AnimalHydrogen-Ion ConcentrationNitric Oxide SynthaseCerebral ArteriesVasoconstrictor AgentsRNA, MessengerThioamidesVascular ResistanceHemodynamicsPia MaterHeart RateMonocrotalineCapillariesAsphyxiaHyperventilationAtmospheric PressureBlood Flow VelocityPhrenic NerveEnzyme InhibitorsNitric Oxide Synthase Type IIICells, CulturedVentricular Function, RightEndothelin-1Regional Blood FlowVasodilator AgentsPregnancyEndothelium, VascularHeavy Ion RadiotherapyBrainArteriolesSodium CyanidePlethysmography, Whole BodyDiaphragmMyocytes, Smooth MuscleMountaineeringLarge-Conductance Calcium-Activated Potassium Channel beta SubunitsHypoventilationSheep, DomesticRespiratory Physiological PhenomenaUp-RegulationNitroarginineNorepinephrineHeme Oxygenase (Decyclizing)Myocardium15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidProcollagen-Proline DioxygenaseRespiratory MusclesFetusMedulla Oblongata