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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.
All prokaryote and eukaryote cells have plasma membranes. The plasma membrane (also known as the cell membrane) is the outermost cell surface, which separates the cell from the external environment. The plasma membrane is composed primarily of proteins and lipids, especially phospholipids.