1a. The top of Denali, Alaska (Mt. McKinley), is 20,322 feet above sea level and the total atmosphericpressure is 360 mm Hg. Assuming that the fractional content of oxygen in air is 0.21 (or 21%), what isthe PO₂ in dry air at the top of Denali?1b. If normal ventilation of alveoli results in an alveolar oxygen partial pressure that is 66% ofatmospheric PO2, then what would be the predicted alveolar PO2 of someone at the top of Denali?1c. If blood passing through the capillaries of the lung comes into equilibrium with alveolar PO2, whatwould be the PO2 of arterial blood of someone at the top of Denali?

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1a. The top of Denali, Alaska (Mt. McKinley), is 20,322 feet above sea level and the total atmospheric pressure is 360 mm Hg. Assuming that the fractional content of oxygen in air is 0.21 (or 21%), what is the PO₂ in dry air at the top of Denali?

1a. The top of Denali, Alaska (Mt. McKinley), is 20,322 feet above sea level and the total atmospheric pressure is 360 mm Hg. Assuming that the fractional content of oxygen in air is 0.21 (or 21%), what is the PO₂ in dry air at the top of Denali?

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter46: Gas Exchange: The Respiratory System

Section: Chapter Questions

Problem 5TYK

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Question

1a. The top of Denali, Alaska (Mt. McKinley), is 20,322 feet above sea level and the total atmospheric
pressure is 360 mm Hg. Assuming that the fractional content of oxygen in air is 0.21 (or 21%), what is
the PO₂ in dry air at the top of Denali?
1b. If normal ventilation of alveoli results in an alveolar oxygen partial pressure that is 66% of
atmospheric PO2, then what would be the predicted alveolar PO2 of someone at the top of Denali?
1c. If blood passing through the capillaries of the lung comes into equilibrium with alveolar PO2, what
would be the PO2 of arterial blood of someone at the top of Denali?

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