What role do hairs and mucus in the nose play in defense?

Hairs and mucus in the nose play a crucial role in the body's defense system by trapping particles that may contain pathogens. The fine hairs, often referred to as cilia, help to filter inhaled air by catching dust, pollen, and other foreign particles. Mucus, produced by the lining of the nasal passages, serves a dual purpose: it further traps these particles and also moistens the air as it is breathed in. This combination ensures that fewer harmful substances reach the lungs and can help prevent infections.

This protective mechanism is an essential part of the respiratory system, helping to keep the airways clear and reducing the likelihood of respiratory illnesses. By preventing pathogens from entering deeper into the body, the mucus and hairs play a pivotal role in maintaining overall health. In contrast, the other choices pertain to different functions that are not performed by hairs and mucus in the nose.