THE GOLGI APPARATUS

The Golgi apparatus consists of flattened membranous sacs. They look like a stack of pita bread. A cell may have several interconnected stacks. Each cisterns in a stack consists of a membrane. This membrane separates its internal space from the cytosol. Vesicles concentrated near the Golgi apparatus. They are used in the transfer of material between the Golgi and other structures.

After leaving the ER, many transport vesicles travel to the Golgi apparatus. GoIgt apparatus is a center of manufacturing, storing, and transportation. Here. products are niodified and then sent to other parts. The Golgi apparatus are extensive in cells specialized for secretion.

The Golgi apparatus generally has two poles. The meml,ranes of cisternae differ in thickness and molecular composition at opposite ends of a stack. The two poles of a Golgi stack are:

  • The cis-face (or forming face): The cis face is located near ER.
  • The trans face (or maturing face): This end acts as the receiving and shipping departments of the Golgi apparatus. The Golgi Apparatus

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Formation of secretions in the Golgi Apparatus Following steps take place during formation of secretions:


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  1. Transport vesicles move material from the ER to the Golgi. A vesicle buds from the ER. They forms transport vesicles. This transport vesicle fuses with cis face of Golgi apparatus and transfer its contents to Golgi membrane.
  2. The trans face gives rise to secretary vesicles. These secretary vesicles pinch off and travel to other sites.
  3. Products of the ER are modified during transport from the cis pole to the trans pole of the Golgi Proteins, Various Golgi enzymes modify oligosaccharide portions of glycoproteins. The oligosaccharides of glycoproteins are identical in he ER. The Golgi removes some sugar monomers and substitutes others. S they produce different types of oligosaccharides. The trans face of the rib some budded of as secretary vesicle4. secretary vesicles fuse with the plasma membrane. This product is finally
    ex orted outside.

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