Question

Give reason for this: Fine hair and mucus are present in the nasal passage.

Answer 1

Fine hair and mucus in the nasal passage:

Fine hair (cilia) and mucus are present in the nasal passage to trap dust particles, pollen grains, and other foreign materials present in the inhaled air. The mucus is sticky and helps to trap these particles. The cilia then move the mucus and trapped particles out of the nasal passage. This prevents these particles from entering the lungs, protecting the respiratory system.