An increase in altitude reduces the O 2 supply for air breathers because at higher altitudes,

Atmospheric pressure decreases with increasing altitude, which results in a reduction in the partial pressure of oxygen in the air. This reduction in oxygen concentration decreases the amount of O 2 available for air breathers at higher altitudes.

An increase in altitude reduces the O 2 supply for air breathers because at higher altitudes,

Atmospheric pressure decreases with increasing altitude, which results in a reduction in the partial pressure of oxygen in the air. This reduction in oxygen concentration decreases the amount of O 2 available for air breathers at higher altitudes.

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An Increase in Altitude Reduces the O₂ Supply for Air

Question 154

Multiple Choice

An increase in altitude reduces the O₂ supply for air breathers because at higher altitudes,

A) oxygen makes up a smaller percentage of the gases in air.
B) atmospheric pressure decreases.
C) temperature of air decreases.
D) humidity increases.
E) increased fluid coats the respiratory membranes.

Correct Answer: