HypercapniaCarbon DioxideCircadian RhythmAnoxiaChemoreceptor CellsRespirationAcidosis, RespiratoryHypocapniaPulmonary VentilationPartial PressureOxygenCerebrovascular CirculationRespiratory MechanicsBlood Gas AnalysisApneaAcidosisTidal VolumeAcid-Base EquilibriumCarotid BodyHyperoxiaPia MaterHyperventilationHydrogen-Ion ConcentrationAsphyxiaBlood PressurePhotoperiodWakefulnessHydrocortisoneHypoventilationPlethysmography, Whole BodyPhrenic NerveHeart RateDiaphragmSleepDarknessRespiratory Physiological PhenomenaTime FactorsRespiration, ArtificialCerebral ArteriesRespiratory MusclesRespiratory InsufficiencyIntercostal MusclesAcetazolamideMedulla OblongataRats, Sprague-DawleySalivaRespiratory CenterOxygen ConsumptionInsufflationAnimals, NewbornBicarbonatesBlood Flow VelocityDoxapramBrain StemPulmonary Gas ExchangeLightBrainRespiratory Function TestsCarbonic Anhydrase InhibitorsSodium CyanideObesity Hypoventilation SyndromePulmonary Stretch ReceptorsSleep Apnea SyndromesBody TemperatureOximetryInhalationMoonVagotomySuprachiasmatic NucleusVasodilation