Quick Notes on Golgi Complex:- 1. Structure of Golgi Complex in Cell 2. Origin of Golgi Complex in Cell 3. Function.
Structure of Golgi Complex in Cell:
Ultra structural analysis reveals the presence of three membranous components:
flattened sacs or cisternae, small tubules and vesicles and large vacuoles.
The cisternae or lamellae are the most constant elements of the Golgi complex. 3-8 flattened, parallel sacs piled one upon the other to form stacks (Fig. 2.44). The Golgi complex is polarized with a forming face on the outer side and a maturing face on the opposite side.
On the forming face, the cisternae are formed while on the maturing face, the cisternae bud off secretary vesicles. The small vesicles are 400- 800A in diameter and are intimately associated with the cisternae and may show continuity with them. The large vacuoles are clear, and generally lie at the edge of the complex.
They represent modified and expanded cisternae in which the two membranes are widely separated, with enlarged vacuolar space.
Origin of Golgi Complex in Cell:
Golgi complex is constantly being formed, changed, broken down and reformed. The Golgi complex is variously described as being formed from the plasma lemma, nuclear envelope, annulate lamellae and the endoplasmic reticulum (Fig. 2.45).
Function of Golgi Complex in Cell:
Golgi bodies are involved in the synthesis, packaging and secretion of different substances (Fig. 2.46). Secretory products are found in the cisternae of the Golgi complex. In some cells, formed products appear in the expanded ends of the Golgi lamellae while in others, the secretory product completely fill the cisternae.
The Golgi complex plays an important role in the synthesis of the carbohydrate components of plasma membrane. Pectin’s and hemi- celluloses, which are the components of the cell plate matrix, are also contributed by the Golgi complex.