alleryStart learning →Which antibacterial products are secreted by the serous and mucus-producing cells of the nasal lining?
AHistamine and heparin
BSurfactant and mucin
CLysozyme and defensins
DInterferon and lactase
Answer & Solution
Correct answer: C. Lysozyme and defensins
1. The nasal lining defends the airway chemically as well as mechanically.
2. Its serous and mucus-producing cells secrete the enzyme lysozyme and proteins called defensins.
3. Both carry antibacterial properties, so the third option is correct.
4. Surfactant is made by type II alveolar cells far lower in the lung, which rules out the second option.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.1 Organs and Structures of the Respiratory System_
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