Biology / Bio 0257 · Atom · ~20 seconds
The Plasma Membrane, Introduced
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The plasma membrane is a phospholipid bilayer with embedded proteins that separates a cell's interior from its surroundings.
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The membrane controls passage of organic molecules, ions, water, and oxygen inward while letting wastes like carbon dioxide pass out.
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This entry names the membrane's structure; this unit's closing block covers exactly how each substance crosses it.