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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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