Since nasal mucosa is the first site to come in contact with the substances from the inhaled air, it has the ability to confer protection against antigens. There are different ways to carry out this function:1
Reference(s): 1 Roecken M, Grevers G, Burgdorf W. 2003. Nasal polyps. In: Color Atlas of Allergic Diseases. Germany: Thieme. pCXLVIII.