What structure sweeps mucus and pathogens from the nasal cavities and trachea to the pharynx?
a. Ciliated epithelium
b. Simple squamous epithelium
c. Alveolar macrophages
d. Elastic connective tissue
ANS: A
The mucosa in the nose and trachea is ciliated epithelium; mucus with trapped dust and microorganisms is swept upward toward the pharynx and is usually swallowed. Simple squamous epithelium does not have cilia. Alveolar macrophages destroy foreign particles in the alveoli, not the trachea. Connective tissue does not fight pathogens.
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