I suffer from chronic allergies, and I find the cilia of the epithelial membranes fascinating. These tiny hairs guard the mucous membranes by grabbing onto particles of dust or other foreign matter.
After they catch something, the cilia move to and fro to push the particle either toward the pharynx so that it can go through the body’s digestive system and exit the body or to the nostrils, where it can be blown out.
These little catchers are dedicated to the team of the epithelial membranes. I’m sure that my allergies would be a lot worse if not for the efforts of the cilia.