السؤال 23

Spot the error in this respiratory claim: 'Airway mucus traps particles, and cilia normally move the trapped material deeper into the lungs.' What is wrong?

Mucus cannot trap inhaled particles.
Cilia should move mucus toward the throat.الإجابة الصحيحة
Cilia exchange oxygen with nearby blood.
Particles normally move through alveolar walls.

الشرح

Mucus does trap many inhaled particles, but cilia sweep the mucus toward the throat rather than deeper into the lungs. Gas exchange is not the cilia's role; their coordinated movement helps clear trapped material from conducting airways.

الشرح

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