1. The summit elevation of Mount Everest is 29,000 ft with an atmospheric pressu

Question

1. The summit elevation of Mount Everest is 29,000 ft with an atmospheric pressure of 265 mm Hg. Although atmospheric pressure is 65% lower than the pressure at sea level, the % oxygen content of the air is the same as sea level (21%) and airway PH2O = 47 mm Hg. Using this information calculate the PO2 that would exist in the conducting airways.

PO2 = ____________

2. Calculate the physiologic dead space volume during exercise if the anatomic dead space is 175 ml and the alveolar dead space (300 ml at rest) changes by 20%.

3. As a precaution against the problem of decompression sickness, N2 is sometimes replaced with helium. Calculate the equilibrated arterial plasma helium concentration that would be present in the blood of a diver if the air mixture within his tank contains 21% oxygen, 79% helium, 0% CO2 at atmospheric pressure (760 mm Hg), airway PH2O = 47 mm Hg and He solubility is equal to 0.085 ml/100 ml blood x mm Hg. You can assume that alveolar PHe = arterial PHe. (Remember to express your result in correct units)

[He] = _________________

Explanation / Answer

1. According to Boyle's law, pressure is inversely proportional to volume. Now, if you say that the volume of oxygen remains same at height as well as the sea level, means there would be no change in pO2 of oxygen.

The change in atmoshpheric pressure is due to change in volume of other gases, but not oxygen...

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