Which of the following statements about the isothermic saturation boundary is true?
a. Exercise causes the isothermic saturation boundary to shift higher in the trachea.
b. At 2 cm above the carina, inhaled gas reaches BTPS.
c. Inhalation through the mouth shifts the isothermic saturation boundary down-ward.
d. Below the isothermic saturation boundary, temperature and relative humidity are var-iables.
ANS: C
At the isothermic saturation boundary inhaled gas reaches BTPS, which is below the carina. The temperature and relative humidity are constant after that point. Because exercise causes an in-crease in the volume, rate, and type of breathing (i.e., breathing through the mouth), the isother-mic saturation boundary would shift downward.
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