HyperoxiaOxygenPulmonary AlveoliHyperbaric OxygenationLungAnimals, NewbornAnoxiaCarotid BodyPartial PressureChemoreceptor CellsLung InjuryIon-Selective ElectrodesRetinal VesselsBronchopulmonary DysplasiaRetinopathy of PrematurityPneumocytesMicroscopy, Electrochemical, ScanningCarbon DioxideOxygen ConsumptionBlood Gas AnalysisOxygen Inhalation TherapyRats, Sprague-DawleyHypercapniaRespirationRespiratory MechanicsAirPulmonary Surfactant-Associated Protein C