What role does the cell membrane play in a cell?

Cell membrane:

1. The cell membrane is also referred to as the plasma membrane.
2. All cells are bound by a cell membrane that encloses the living protoplasm consisting of cytoplasm and nucleus.
3. It is a double-layered, living structure made up of phospholipids.

Role of cell membrane:

1. The cell membrane protects the contents of the cell and also gives shape to the cell.
2. This thin membrane is porous and selectively permeable.
3. Being selectively permeable, the plasma membrane only allows some substances to pass through it but not others.