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
Suppose that there are six pairs of alleles which control height and that every dominant allele adds 5cm to the stature. Assume also that the average height of an adult (with equal

CLE A V AG E - Holoblastic & unequal. First plane is meridional. 2 blastomeres are formed. 1 megamere & another micromere. 2nd plane is also meridional but at 90° to fir

What are chylomicrons? Yes, so you now know that chylomicrons are basically lipoprotein molecules which are water miscible. They are poured into lymphatic vessels through lacte

Q. Show the Peptide found in the brain? There are as many as 300 peptide neurotransmitters found in the brain. Peptide is a short protein consisting of fewer than 100 amino aci

What factor helps us in identifying the type of bone graft to be used? The following factors help us in identyfying the bone graft to be used: i) Whether graft is osteoinduc

Double helical structure of dna

Concerning digestion how are poriferans characterized? Sponges are dissimilar from other animals since they present only intracellular digestion. They do not have a digestiv

Explain Indications for Surgery of Congenital Pulmonary Stenosis ? Interventional treatment is required for all neonates presenting with critical pulmonary valvar stenosis. Thi


A general agreerncnt anlong nll the human evolutionists who may have a very radical philosophical hackground and convictions is that man is the result of an extraordinary evolution