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Plasma has been derived from the word that means form or shape so plasma membrane means the membrane that gives shape or form to the cell. This is the reason that cell membrane is also called plasma membrane.
A cell membrane is also known as a plasma membrane or  cytoplasmic membrane. The cell membrane separates the  interior of a cell from its outside environment. The main functâ¦ion  of a cell membrane is to protect the cell from its surroundings. Making the world better, one answer at a time.