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A membrane in a thin, film-like structure that acts as a barrier against fluids. Membranes come in many different types -- mainly biological and synthetic. Biological membranes are usually found inside of your body, covering organs, or anywhere else where moisture is necessary. Some examples of where biological membranes can be found are on the inner walls of your cheeks (your mouth), a thin layer on the outside of your eyes, the glans of a human penis, the inside of a vagina, and covering the outside of a penis for several species of animals that have some form of sheath.
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