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- Dictionarymembrane/ˈmɛmbreɪn/
noun
- 1. a thin sheet of tissue or layer of cells acting as a boundary, lining, or partition in an organism: "the nucleus is a distinct region with a membrane around it"
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noun
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Thin, film-like structure that separates two fluids, acting either as a selective barrier or a separating structure
A membrane is a selective barrier; it allows some things to pass through but stops others. Such things may be molecules, ions, or other small particles. Membranes can be generally classified into synthetic membranes and biological membranes. Biological membranes include cell membranes (outer coverings of cells or organelles that allow passage of certain constituents); nuclear membranes, which cove... Wikipedia