What happens to a dust particle that is too small to fall from the inspired air and land in the alveoli?
A) It lands in the mucociliary ladder, where type II macrophages phagocytize it.
B) It lands in the mucociliary ladder, where it is moved to the trachea to be exhaled.
C) It lands in the bronchi, where it is absorbed.
D) It is inhaled and then exhaled.
E) It lands in the respiratory bronchiole, where it is coughed out
Correct Answer:
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