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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.
Cells are considered the basic units of life in part because they come in discrete and easily recognizable packages. That's because all cells are surrounded by a structure called the cell membrane â which, much like the walls of a house, serves as a clear boundary between the cell's internal and external environments. The cell membrane is sometimes also referred to as the plasma membrane.