What is the primary function of mucus in the nasal cavity?

The primary function of mucus in the nasal cavity is to trap particles and humidify the air. The nasal passages are lined with a mucous membrane that secretes mucus, which plays a crucial role in respiratory health. Mucus captures dust, pollen, pathogens, and other particulate matter inhaled with air, preventing them from entering the lungs and contributing to respiratory infections or irritation.

Additionally, as air passes through the nasal cavity, mucus helps to humidify the air, making it more suitable for the delicate tissues in the lungs. This is particularly important because dry air can cause irritation and inflammation within the respiratory tract.

While warming incoming air, aiding in olfaction, and facilitating air passage are also important functions of the nasal cavity, these processes occur as secondary functions and often in conjunction with the primary role of mucus in trapping particles and humidifying the air.