The skin on your body stops at your mucous membranes. Mucous membranes are found in your mouth, nose, and throat. They are also found in your reproductive organs and in your anus and rectum. The mucous membranes produce mucus, which is a thick, wet substance that helps to keep your body tissues moist. The mucous membranes also have tiny hair-like structures called cilia. The cilia help to move the mucus and keep it from getting too thick.
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