What is the role of nasal mucosa in the respiratory system?

The nasal mucosa plays a crucial role in the respiratory system primarily by filtering and humidifying the inhaled air. As air passes through the nasal cavity, the mucosa, which is lined with ciliated cells and mucus-secreting glands, traps dust, allergens, and pathogens, preventing them from entering the lungs. This filtering process is vital for maintaining healthy lung function and protecting the respiratory tract from irritants and infections.

Additionally, the nasal mucosa adds moisture to the air, ensuring that it is adequately humidified before reaching the delicate tissues of the lungs. This is important because dry air can irritate the respiratory tract and hinder gas exchange.

While nasal mucosa does provide some level of defense against bacterial infections, as it does contain immune cells, the primary function of filtering and humidifying the air is more predominant in its role within the respiratory system.