What are the roles of mucus?

Mucus serves several important roles in the body, primarily as a protective barrier. It traps dust, pathogens, and other foreign particles, preventing them from entering the respiratory and gastrointestinal tracts. Additionally, mucus helps to keep tissues moist, facilitating the movement of food in the digestive system and aiding in respiratory functions. It also contains antibodies and enzymes that contribute to the immune response.