What is the point in the respiratory track where inspired gas reaches body temperature, ambient pressure, saturated (BTPS) conditions?
a. Point of thermal equilibrium
b. Hygroscopic saturation boundary
c. Thermal inversion boundary
d. Isothermic saturation boundary
ANS: D
As inspired gas moves into the lungs, it achieves BTPS conditions (body temperature, 37° C; barometric pressure; saturated with water vapor [100% relative humidity at 37° C]). This point, normally approximately 5 cm below the carina, is called the isothermic saturation boundary.
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