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
How many protein require patient in a day Patients who require high protein diets are encouraged to drink 600-800 mL of milk a day. Now, you must be wondering how one can consu

What is more and less biologically complex out of whey protien and ice cream and why?

Animal tissue

Describe how to Analysis and Evaluation of JVP ? 1) Elevated: Any cause producing right ventricular, failure or in pericardial effusion and in constrictive pericardiitis when p

Stentless Devices : A bioprosthesis mounted on a stent reduces the effective orifice area (EOA). The newer version (third generation) stentless gluteraldehyde preserved porcine v

Benefits of diet modification are: 1) Control of sugar. 2) Control of weight. 3) Control of blood pressure. 4) Control of lipid profile. 5) Good health and well bei

HIS T O R Y - Protoplasm was first seen by Corti, 1772 F . Dujardin called it "Sarcode" & observed it in animal cell Term "Protoplasm" was given by J.E. Pu

is cnidaria having both interacellular & extracellular digestion?

What is Carbon Cycle explain briefly? Life on earth is mainly carbon-based. Most of the material substances that make up living organisms consist of organic compounds of carbon

Q. What are some prophylactic measures for tapeworm infections? The major prophylactic measures against the taeniasis and the cysticercosis are not to ingest raw or badly cooke