Golgi apparatus, Biology

GOLGI APPARATUS

Camillo Golgi in 1898 discovered a reticular structure in the cytoplasm of nerve cells with the help of metal impregnation technique using silver nitrate for which he received the Nobel Prize. This structure was named as Golgi apparatus or Golgi complex after him. Golgi complex is located near thecell nucleus.

Golgi complex is structurally similar in both plant and animal cells, but in plant cells it is more evident and is called as dictyosomes which are stack-like or plate-like bodies. Animal cells contain comparatively much smaller number of Golgi apparatus than plant cells.

The Golgi complex consists of (a) stack of flattened sacs or cisternae (b) small rounded transport vesicles (c) larger vacuoles filled with amorphous or granular material.

The cistemae, which are flattened sac like vesicles of Golgi complex, are arranged in parallel series and are separated by a space of 20-30 nm. Cisternae are gently curved so that the Golgi bodies give a bow like appearance (Figure shown below). The convex side facing the endoplasmic reticulum is 'forming' or 'proximal'-face, whereas the concave side oriented towards cell surface is the 'releasing' or 'distal' face of the complex.

2347_golgi apparatus.jpg

 


Small vesicles called transition vesicles are frequently seen lying between rough endoplasmic reticulum and the forming face. It is thought that these vesicles are formed from the ER and migrate to Golgi, where they form new cisternae, which get fused with existing cisternal membrane, and thus the growth of the organelle occurs. New cistemac are formed at the forming face to compensate for the loss of secretory vesicles of the releasing face. The transformation of membrane from one type to another is a step which leads to the formation of a vesicle. The chemical composition of Golgi complex is intermediary between ER and the plasma membrane.

Posted Date: 12/10/2012 1:58:07 AM | Location : United States







Related Discussions:- Golgi apparatus, Assignment Help, Ask Question on Golgi apparatus, Get Answer, Expert's Help, Golgi apparatus Discussions

Write discussion on Golgi apparatus
Your posts are moderated
Related Questions
Explain Xanthan Gum Xanthan gum is a microbial polymer prepared commercially in pure culture fermentation from Xanthomonas campestris. This polysaccharide was given the generic

Q. From which germ layer do the liver and the pancreas originate? What are other organs and tissues made from that germ layer? The pancreas and the liver are originated from th

Chronic Aortic Regurgitation :  Several factors have to be taken into account before recommending surgery. These include severity of symptoms and LV function. With evidence o

Congenital impotentia genarandi Some bulls which are otherwise normal and healthy produce semen containing spermatozoa with specific morphological abnormalities together with

Primary Succession - Community Change In primary succession on a terrestrial site the new site is first colonised by a few hardy pioneer species that are often microbes, liche

Explain the Objectives of nutritional care? - To minimize the development of nutrient imbalance. - To maintain fluid and electrolyte homeostasis - To promote energy equil

Candidiasis Candidiasis (Moniliasis) is a disease of man, animals and birds and is caused chiefly by Candida albicans. Crop mycosis (thrush) of poultry is caused by C. albicans

What is the structure that maintains identical chromatids bound? Ans) The structure that handles identical chromatids bound is the centromere.

Anti Lipid Drugs :  The current thinking is that it is very important to keep lipid levels low. It helps in preventing atherosclerotic changes in venous grafts and the long-term p

Define Carbohydrate Metabolism of manganese? Mn is required for carbohydrate metabolism. Enzymes pyruvate carboxylase and phosphoenol pyruvate carboxy kinase involved in glucon