Damage to the cilia of the airways by smoking leads to
Correct answer: C. accumulation of mucus and debris, producing the smoker's cough
- A. improved filtering of dust
- B. faster removal of mucus
- C. accumulation of mucus and debris, producing the smoker's cough
- D. widening of the trachea
Explanation
Healthy cilia sweep mucus and trapped particles upwards, and when smoke paralyses them the debris collects instead. The cough is the body's substitute for the lost escalator.
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About Human Respiratory System
The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
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