Question

Why is cell membrane also known as plasma membrane ?

Answer 1

Besides "water is a good conductor of electricity", the membrane of the cell is the outermost membrane of the cell and the one that separates the rest of the cell from the environment. Just inside of the cell membrane, is the cell's plasma. The plasma is the "filling" of the cell, and holds the cell's organelles. So, the outermost membrane of the cell is sometimes called the cell membrane and sometimes called the plasma membrane, because that is what it's in contact with

Answer 2

$\huge\sf\underline\blue{Answer}$

The plasma membrane, also called the cell membrane, is the membrane found in all cells that separates the interior of the cell from the outside environment. ... The plasma membrane consists of a lipid bilayer that is semipermeable. The plasma membrane regulates the transport of materials entering and exiting the cell.