Which of the following are true about the function of the upper airways? 1. They cool inspired air. 2. They filter out secretions. 3. They humidify inspired air. 4. They keep the nasal mucosa moist
a. 1, 2, and 3 c. 2 and 4
b. 1 and 3 d. 3 and 4
ANS: D
The upper airway is responsible for humidifying inspired air. The upper airways add heat and humidity to inspired gases during inhalation. The nasal mucosa is kept moist by secretions from the mucous glands. Humidity and warmth are captured by the nasal mucosa, and exhaled air is cooled.
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