Describe the proteins of plasma membrane

Plasma membrane is a thin membrane that surrounds every living cell, separating it from the external environment around it. The plasma membrane consists of water-soluble substances like nucleic acids, proteins, carbohydrates. Typically, the plasma membrane defines the boundary of a cell. Apart from protecting the constituents of the cell, substances are exchanged through the surface of the plasma membrane.

The plasma membrane is composed of lipids and proteins that contribute to the functioning of the membrane. Even though the plasma membrane is the only barrier between internal components of the cell and the extracellular environment in some species. In some organisms, have an extra-barrier, apart from plasma membrane called the cell wall. Functions of plasma membrane include protection, selective permeability, cell signaling, endocytosis and exocytosis.