what is the Po2 of inspired humidified air at the summit of mount Everest (assume atmospheric...

what is the Po2 of inspired humidified air at the summit of mount Everest (assume atmospheric pressure is 247 mm Hg)

Expert Solution

Atmospheric pressure and inspired oxygen pressure fall roughly linearly with altitude to be 50% of the sea level value at 5500 m and only 30% of the sea value value at 8900 m (the height of the summit of everest)

The peak of Mount Everest 8848m above sea level is the Highest point on the earth. The barometric pressure(PB) a peakis ~255mm Hg approximately one- third that at sea level and ambient partial pressure of oxygen is only~53mmHg.

For a climber At the peak of Mount Everest the Po2 of humidified insipired air entering the alveoli is even lower because of the effects of water vapour (PH2o = 47mm Hg at 37°c). Therefore the insipired Po2 is less than 149 mm Hg At sea level.

Hypoxia is the major problem at summit of Mount Everest

Calculation:

Inspired Po2= percentage of O2 (21%)× ( barometric pressure- partial pressure of water vapour)

Barometeric pressure = 247 mm Hg( given)

Partial pressure of water vapour = 47 mmHg

= 21%× ( 247-47)

= 21% × 200 mmHg

= 21/100 × 200 mmHg

= 21× 2mmHg

= 42mmHg

Sydney Mullin answered 1 year ago

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