Lymphatic System

Nonspecific Defenses

How do the mucous membranes provide a defense against microorganisms?

Mucous membranes line the epithelial layer of many of the body cavities, such as the nasal passages, respiratory tract, and digestive tract. Since the mucous is viscous and slightly sticky, it traps many microorganisms, preventing them from attaching to the epithelium or entering the tissue. Some of these membranes are also ciliated, which helps to move trapped particles away from the body.


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