cell membrane

A cell membrane is like a cell's gatekeeper. It's the outer layer that surrounds a cell, letting substances in — or keeping them out.

A membrane is a barrier that offers protection, like a rubber membrane that keeps rain from seeping under your roof. A cell membrane surrounds and protects the contents of a cell. It controls which substances can enter and exit the cell. The membrane also gives a cell its shape and enables the cell to attach to other cells, forming tissues.

Definitions of cell membrane
  1. noun
    a thin membrane (a double layer of lipids) enclosing the cytoplasm of a cell; proteins in the membrane control passage of ions (like sodium or potassium or calcium) in and out of the cell
    “all cells have a cell membrane
    synonyms: cytomembrane, plasma membrane
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    type of:
    semipermeable membrane
    a membrane (as a cell membrane) that allows some molecules to pass through but not others
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