Plasma membrane

The cell is bounded by a lipoprotein membrane which is selectively permeable, and in specialized cells like nerve cells is responsible for the conduction of impulses (excitation). The plasma membrane together with the surrounding cell cement forms the cell membrane, the structure visible under the light microscope. In plant cells the cell membrane is surrounding by a cell wall.
The Golgi complex consists of a system of smooth membranes in the form of cisternae and vesicles. Various functions have been ascribed to the Golgi complex. The main function is the concentration and budding off of secretary products and carbohydrate synthesis.