The function of cilia in the respiratory passage is to keep the airways clear of:

Explanation

Cilia, tiny hair-like structures lining the respiratory passages, play a crucial role in clearing dust and other particulate matter by moving mucus out of the airways. This action prevents inhaled particles from reaching the lungs. Goblet cells produce mucus that traps these particles, which cilia then transport out of the airway through rhythmic beating. Cilia do not clear gases like oxygen, carbon dioxide, or carbon monoxide from the respiratory system; these gases are involved in gas exchange processes but are not removed by ciliary action.