mucous membrane
The mucous membrane lines all body cavities that open to the exterior, such as those of hollow organs of the respiratory, digestive, urinary, and reproductive tracts.
To trap inhaled dust particles or airborne pathogens so that they don't get down into your lungs, a one-way dead-end street.
the mucouse membrane looks like an fly catcher because if we don't have it the bad smell will come to your soul because it cathes bad smell
It coats the nasal cavity and collects pathogens.