A high-flow nasal cannula set at 15 L has been running for a while without water. Which of the following could have happened?
a. The cilia function increases.
b. Turbulent convection stops.
c. Airway resistance decreases.
d. The isothermic saturation boundary shifts.
ANS: D
The isothermic saturation boundary shifts deeper into the lungs when a person inhales through cold, dry air. In this case, the cilia function decreases and secretions are produced, increasing airway resistance. The turbulent convection increases contact between the inspired air and the mucosa.
You might also like to view...
Declared brain-dead patient whose organs are being removed for donor purposes
A) -P3 B) -P4 C) -P5 D) -P6
Which of the following occur in pressure-limited modes of ventilation?
1. The volume delivered at a given pressure must decrease as compliance falls. 2. The inspiratory flow varies with patient effort and lung mechanics. 3. Active effort by the patient against inspiration will decrease delivered volume. 4. The volume delivered at a given pressure must increase as Raw rises. a. 1 and 3 only b. 1, 2, and 3 only c. 3 and 4 only d. 2, 3, and 4 only