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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 (also called the plasma membrane, plasmalemma, or phospholipid bilayer) surrounds the cytoplasm of a cell and, in animal cells, physically separates â¦ the intracellular components from the extracellular environment, thereby serving a function similar to that of skin.he thin structure that surrounds the cytoplasm of a cell is called as cell membrane. This is present in most plant, animal and fungi cells.