文档介绍：**?herateofgasdiffusionPartialPressureofIndividualGasesinaGasMixtureAbovetheabsolutetemperature,,.**AppliedGasLawsQuestionAtthesealevel(barometricpressureis760mmHg),howmuchisthepartialpressureofoxygenifweknowairconsistsof21%oxygen?HintsDalton’,thepartialpressureofagivengasisdirectlyproportionaltothevolumethatgascontributestothetotalvolume.**AnswersPB=PN2+PO2+PHO2+PCO2(atthesealevel,PB=760mmHg).WherePB=(氧分压).PO2intheair==160mmHg.**PartialPressuresofIndividualGasesattheSealLevel(PB=760mmHg)**AmbientDryair(mmHg)MoistTrachealAir(mmHg)AlveolarAir(mmHg)SystemicArterialBlood(mmHg)MixedVenousBlood(mmHg)O21601501029540CO200404046WaterVapor047474747N2600563571571571Total760760760760704WaterVapor(水蒸汽)LowersPO2onceAirIsBeingHumidified(湿化),PO2=(760–47)=150mmHgPN2=(760–47)=563mmHg**ThePartialPressureofOxygenintheAlveolarSpaceisdownto102mmHgTworeasonscausethis“down”.**TheDeterminantsofAlveolarPO2**FactorsthatDetermineAlveolarPCO2**