Question: what are four functions of the cell or plasma membrane

title: Cell membrane
text: The cell membrane ( also known as the plasma membrane or cytoplasmic membrane , and historically referred to as the plasmalemma ) is a biological membrane that separates the interior of all cells from the outside environment ( the extracellular space ) . It consists of a lipid bilayer with embedded proteins . The basic function of the cell membrane is to protect the cell from its surroundings . The cell membrane controls the movement of substances in and out of cells and organelles . In this way , it is selectively permeable to ions and organic molecules . In addition , cell membranes are involved in a variety of cellular processes such as cell adhesion , ion conductivity and cell signalling and serve as the attachment surface for several extracellular structures , including the cell wall , the carbohydrate layer called the glycocalyx , and the intracellular network of protein fibers called the cytoskeleton . In the field of synthetic biology , cell membranes can be artificially reassembled . 

Answer: answer: The cell membrane separates the interior of all cells from the outside environment, protects the cell from its surroundings, controls the movement of substances in and out of cells and organelles, and serve as the attachment surface for several extracellular structures.