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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?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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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? 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?
Transcribed Image Text: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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