The amount of oxygen present in the blood depends in part on the partial pressure of inspired oxygen in the trachea, P.o. This can be calculated from the barometric pressure, the fraction of O2 molecules in dry air, and the vapor pressure of water at body temperature (because inhaled air is humidified in the trachea). 20.9% of the molecules in dry air are O2 molecules and the vapor pressure of water at body temperature (37 °C) is 47 mm Hg. Taking the total pressure of the humidified inhaled air to be equal to the barometric pressure, calculate the P1o, for a person in Jackson Hole, WY (elevation 1923 meters), if the prevailing barometric pressure is 621 mm Hg. Plo2 mm Hg

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