![]() IN THE TRACHEA THE PO2 IS CALCULATED AS FOLLOWS:.THEREFORE 47 MOST BE SUBSTRUCTED FROM PB TO CALCULATE PGAS IN THE LUNG OR BLOOD. THE WATER PRESSURE AT 37✬ AND 100% RH IS 47mmHg. INSPIRING AIR HEATS IT TO BODY TEMPERATURE (37✬) AND SATURATES IT WITH WATER VAPOR ( 100% RELATIVE HUMIDITY).IN PHYSIOLOGICAL CALCULATIONS THE PCO2 OF INSPIRED AIR IS CONSIDERED O.OXYGEN CONSTITUTES 20.93% OF DRY ATMOSPHERIC AIR, ITS PARTIAL PRESSURE (PO2) AT SEA LEVEL IS AS FOLLOWS:.ACCORDING TO DALTON’S LAW, THE PRESSURE OF EACH GAS COMPRISING AIR IS INDEPENDENT OF THE OTHER GAS PRESSURE AND EXERTS A PARTIAL PRESSURE PROPORTIONAL TO ITS FRACTIONAL CONCENTRATION IN AIR. ![]() AT SEA LEVEL THE PB IS EQUIVALENT TO THE WEIGHT OF A MERCURY COLUMN OF 760 mmHg. THE TOTAL COMBINED PRESSURE EXERTED BY THESE GASES, THE BAROMETRIC PRESSURE(PB) CAN BE MEASURED BY A Hg BAROMETER. THIS TRACES OF ARGON, CARBON DIOXIDE, AND OTHER GASES. AIR IS A GAS MIXTURE OF MOSTLY N2 AND O2.
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