Mucous membranes are part of body defense system and they offer:

Explanation

Mucous membranes are a type of epithelial tissue that lines the inside of many organs, including the respiratory tract, digestive tract, and genitourinary tract. They are part of the body's first line of defense against infection, and they offer physical barriers in several ways: The mucus layer: Mucus is a thick, sticky substance that is produced by the cells of the mucous membrane. It helps to trap bacteria and viruses, preventing them from reaching the underlying tissues. The tight junctions: The cells of the mucous membrane are held together by tight junctions, which are small gaps between the cells. These tight junctions help to prevent bacteria and viruses from passing between the cells. The cilia: The cells of the mucous membrane also have cilia, which are tiny hair-like projections. The cilia move in a coordinated fashion to help move the mucus layer along the surface of the mucous membrane. This helps to remove bacteria and viruses from the surface of the mucous membrane.