Most Foreign Substances in Inspired Air Fail to Reach the Lungs

question 25

Multiple Choice

Most foreign substances in inspired air fail to reach the lungs because of the

• A) porous structure of the nasal conchae.
• B) ciliated epithelium and mucus that line the respiratory passages.
• C) abundant blood supply to the nasal mucosa.
• D) action of the epiglottis.

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