Which of the following is false about the isothermic saturation boundary (ISB)?
a. Below the ISB, temperature and relative humidity remain constant.
b. Above the ISB, temperature and humidity increase during exhalation.
c. The ISB is normally located just below the larynx (vocal cords).
d. Above the ISB, temperature and humidity decrease during inspiration.
ANS: C
This point, normally approximately 5 cm below the carina, is called the isothermic saturation boundary (ISB). Above the ISB, temperature and humidity decrease during inspiration and in-crease during exhalation.
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