Cell HypoxiaAnoxiaFetal HypoxiaHypoxia, BrainAltitudePulmonary ArteryChronic DiseaseOxygenHypertension, PulmonaryHypertrophy, Right VentricularHypoxia-Inducible Factor 1, alpha SubunitAltitude SicknessHypoxia-Inducible Factor 1Atmosphere Exposure ChambersChemoreceptor CellsAcclimatizationPulmonary CirculationCarotid BodyVasoconstrictionRats, Sprague-DawleyRats, WistarLungHypercapniaHematocritPolycythemiaAdaptation, PhysiologicalRespirationUterine ArteryAnimals, NewbornCyanosisPulmonary VentilationRNA, MessengerSheepCarbon DioxideOxygen ConsumptionNitric OxideMuscle, Smooth, VascularTime FactorsDisease Models, Animal