Multiple choice

Select the correct statement regarding airways and lung alveoli.

  1. The mucus lining the upper airways is mainly produced by mucosal glands.

  2. The cartilage in the walls of trachea, bronchi and bronchioles prevents them from disrupting.

  3. The small diameter airways are the main sites of airways resistance.

  4. The upper airways play a crucial role in protecting the lungs from airborne particles.

  5. The alveoli are the only sites of gas exchange.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The airways epithelium play a crucial role in protecting pulmonary tissue from foreign substances by synthesising, mechanical, innate and acquired host defense systems. Airborne particles including pathogens, are absorbed by the layer of mucus lining the airways, where they are destroyed and removed through mucociliary and cough clearance.

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