Much of the filtration, warming, and humidification of the air that enters the respiratory system occurs in the
A)bronchi.
B)lungs.
C)nasal passages.
D)trachea.
E)tertiary bronchi.

Question

Quizplus · Accepted Answer

The nasal passages are lined with cilia and mucus-secreting cells, which help to filter out particles and microorganisms. The air is also warmed and humidified as it travels through the nasal passages, which helps to prevent the drying out of the respiratory tract. Therefore, much of the filtration, warming, and humidification of the air that enters the respiratory system occurs in the nasal passages.

Much of the Filtration, Warming, and Humidification of the Air