Functions of proteins, fats and carbohydrates in the cell membrane.

Membranes are made up of carbohydrates, proteins and lipids held together by non-covalent forces. They regulate the transfer of molecules, control the flow of information between cells, generate signals to alter cellular behavior, contain molecules responsible for cell adhesion in tissue formation, and can separate charged molecules from cellular signaling and energy generation.
Membrane proteins determine the functions of cell membranes, including those that serve as pumps, gates, receptors, cell adhesion molecules, energy converters, and enzymes. Carbohydrates, covalently bound to proteins (glycoproteins) or lipids (glycolipids), are also part of cell membranes and function as adhesion and targeting loci for cells.