Which components in the nose contribute to defense against inhaled particles?

Which components in the nose contribute to defense against inhaled particles?

• A. Mucus and cilia
• B. Hair and mucus
• C. Blood vessels and mucus
• D. Bones and mucus

Answer: (A)

Defense in the nose relies on mucociliary clearance. Mucus traps inhaled particles such as dust, pollen, bacteria, and other irritants, forming a sticky layer on the nasal lining. Cilia are tiny beating hairs that move in a coordinated wave, pushing the mucus and its trapped contents toward the throat to be swallowed or expelled. This continuous clearance prevents contaminants from reaching the lungs and helps keep the airways protected. While nasal hairs provide some filtration of larger particles, the essential defense mechanism described here is the combination of mucus and cilia.

Defense in the nose relies on mucociliary clearance. Mucus traps inhaled particles such as dust, pollen, bacteria, and other irritants, forming a sticky layer on the nasal lining. Cilia are tiny beating hairs that move in a coordinated wave, pushing the mucus and its trapped contents toward the throat to be swallowed or expelled. This continuous clearance prevents contaminants from reaching the lungs and helps keep the airways protected. While nasal hairs provide some filtration of larger particles, the essential defense mechanism described here is the combination of mucus and cilia.