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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.
Why are cell membranes also knowns as lipid bilayers? Cell membranes are composed of a double-layer, or 'bilayer' of molecules known as phospholipids. These have a hydrophilic (water loving) head, the phosphate group, and a hydroâ¦phobic (water hating) tail, a lipid. These molecules line up with the heads facing out and the tails facing in, forming a lipid bilayer.