<prompt> Normal value of arterial HC03 in gas exchange is40-45 meqlL20-24 meqlL10-15 meqlL5-10 meqlL  <response>: B 20-24 meqlL GAS EXCHANGE SEA LEVELArterial 02 tensionPao212.7 -0.7 kPa 95-5mmHgArterial C02 tensionPaco25.3 -0.3 kPa 40 - 2 mmHgArterial 02 saturationSao20.97 -0.02 97 -2Arterial blood pHpH7.40 - 0.02Arterial bicarbonateHCO3-24 2meqfLBase excessBE0 - 2meqfLDiffusing capacity for carbon monoxide single breathDLco0.42 mLCOs per mmHg 25 mL CO min per mmHgDead space volumeVD2 mUkg body wtPhysiologic dead space: dead space-tidal volume ratioVDVT Rest 35 VTExercise 20 VTAlveolar-arterial difference for O2PA-ao22.7 kPa S20 kPa 20 mmHg 