Intestine, SmallIntestinesIntestine, LargeIntestinal MucosaJejunumIntestinal AbsorptionIleumBlood Glucose Self-MonitoringFlowmetersPeak Expiratory Flow RateDuodenumColonIntestinal NeoplasmsMicrovilliAltitudeEnterocytesIntestinal DiseasesDigestive SystemCecumExtraterrestrial EnvironmentReagent StripsTime FactorsSwineDiagnostic EquipmentMarsWalkingGerm-Free LifeEquipment and SuppliesLiverGastrointestinal MotilitySpacecraftBlood GlucoseTissue DistributionStomachEquipment DesignSerous MembraneGastrointestinal TractRNA, MessengerReproducibility of ResultsCaco-2 CellsOrgan SpecificityPaneth CellsMolecular Sequence DataIntestinal SecretionsSucraseMobile ApplicationsEnteritisEpitheliumPoint-of-Care SystemsMonitoring, AmbulatoryCalibrationAnimals, SucklingGastrointestinal ContentsMyenteric PlexusFecesEfficiencyMice, Inbred C57BLDisaccharidasesDigestive System Physiological PhenomenaGastrointestinal TransitMonitoring, PhysiologicIceGlareEnteric Nervous SystemBlood Chemical AnalysisDigestionSpirometryMountaineeringRats, Inbred StrainsAdministration, OralBiological TransportMesenteryRats, Sprague-DawleyGastrointestinal HormonesJupiterHydrogen-Ion ConcentrationEpithelial CellsSaturnDry IceInsulin, Short-ActingImmunohistochemistryRats, WistarWaterElectrolysisJejunal NeoplasmsPeyer's PatchesRheologyAnimals, NewbornRespiratory Function TestsBase SequenceIleal NeoplasmsEcosystemForced Expiratory Flow RatesDrug Dosage CalculationsKidneyAmino Acid SequencePeristalsisEnteroendocrine CellsErgometryMice, Knockout