文档介绍:?herateofgasdiffusion2020/2/61PartialPressureofIndividualGasesinaGasMixtureAbovetheabsolutetemperature,,(barometricpressureis760mmHg),howmuchisthepartialpressureofoxygenifweknowairconsistsof21%oxygen?HintsDalton’,=PN2+PO2+PHO2+PCO2(atthesealevel,PB=760mmHg).WherePB=(氧分压).PO2intheair==(PB=760mmHg)AmbientDryair(mmHg)MoistTrachealAir(mmHg)AlveolarAir(mmHg)SystemicArterialBlood(mmHg)MixedVenousBlood(mmHg)O21601501029540CO200404046WaterVapor047474747N2600563571571571Total7607607607607042020/2/66WaterVapor(水蒸汽)LowersPO2onceAirIsBeingHumidified(湿化),PO2=(760–47)=150mmHgPN2=(760–47)=563mmHg2020/2/67ThePartialPressureofOxygenintheAlveolarSpaceisdownto102mmHgTworeasonscausethis“down”