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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.
The cell membrane is often included in sections about the structure and functions of cell organelles. However, the cell membrane (also known as the plasma membrane) is not within the cell but one of the structures that defines the cell - together with the cell wall in the cases of plant cells and prokaryotic cells.