Rough and smooth endoplasrnic reticulum, Biology

Rough and Smooth Endoplasrnic Reticulum (RER and SER)

ER is differentiated into two regions, granular or rough endoplasrnic reticulum (RER) and agranular or smooth endoplasrnic reticulum (SER). These twb regions also differ considerably in shape: rough ER is organised in stacks of flattened sacs called cisternae and smooth ER consists of a ' A mesh work of fine tubules . In RER, the outer surface in the cytoplasmic site of the membrane is studded with small particles called ribosomes whereas in SER, the ribosomes are absent. Ribosomes are the sites of protein synthesis. Thus, it is evident that RER is more abundant in cells which are actively engaged in synthesis and export of proteins, for example, pancreatic acinar cells and plasma cells. SER is found in those cells which are specialised in lipid metabolism and which secrete steroids such as the cells of adrenal cortex, the testes and ovary. Smooth ER is also present in liver cells where it helps in detoxification of drugs and poisons.

ER (both RER and SER) performs many mechanical functions of the cell by providing mechanical support. Large surface area of ER helps in the exchange of materials across the membrane by diffusion and active transport. ER may act as a kind of circulatory system for the distribution of various substances in the cell.

Posted Date: 12/10/2012 1:47:10 AM | Location : United States







Related Discussions:- Rough and smooth endoplasrnic reticulum, Assignment Help, Ask Question on Rough and smooth endoplasrnic reticulum, Get Answer, Expert's Help, Rough and smooth endoplasrnic reticulum Discussions

Write discussion on Rough and smooth endoplasrnic reticulum
Your posts are moderated
Related Questions
REFLE X ACTION - Marshel Hall discovered reflex action. Best & Taylor defined it. Reflex action is functional unit of CNS. It is sudden, immediate involuntary acti

Patters of Cleavage In most of the animal groups with spherical or almost spherical egg and little or moderate amount of yolk (micro-or mesolecithal eggs), the first and seco

Q. Value of biodiversity? Today, there is widespread concern for conservation of wild animals and plants. One might wonder why there is so much concern about protecting other s

Determine the types of blood There are three types of blood cells. They are Red Blood Corpuscles (RBC), White Blood Corpuscles (WBC) or leucocytes and blood platelets or thromb

Solutes and ions tie up water in solution. Solutes lower aw and this reduction in aw depends on the total concentration of dissolved molecules and ions. Since these bind to water m

What is Endocrine System explain ? The endocrine system consists of glands, organs that secrete hormones. Endocrine glands are tissues that produce secretions within the body,

Role of citrate Citrate in addition to being an  intermediate  of citric acid cycle provides a source of acetyl CoA for  the cytosolic synthesis of fatty acids. Citrate inhi

Q. Dietary modification? Dietary modification includes nutritional support that allows normal growth and development. Plasma phenylalanine concentration between the range of 40

Normal 0 false false false EN-IN X-NONE X-NONE

What is pasteurization of fruit juice?