Rough and smooth endoplasrnic reticulum, Biology

Assignment Help:

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.


Related Discussions:- Rough and smooth endoplasrnic reticulum

Explain the pre pregnancy height and foetal outcome, Explain the Pre Pregna...

Explain the Pre Pregnancy Height and Foetal Outcome? Maternal height prior to conception, determined by heredity, socio-economic environment and maternal nutritional status, is

Effects of cardiac output and hormones, Excluding the effects of cardiac ou...

Excluding the effects of cardiac output and hormones, describe the other factors that may affect blood pressure and blood flow in a middle-aged man who is exercising in an aerobics

Pteridophytes, What are the affinities of pteridophytes with gymnosperms?

What are the affinities of pteridophytes with gymnosperms?

Evolution, what is r and k selection

what is r and k selection

Explain in brief about the trail making test, Explain in brief about the Tr...

Explain in brief about the Trail Making Test In part A of this procedure the subject must connect in order a series of circled numbers randomly scattered over a sheet of 81\2 X

What are pentoses, What are pentoses? What are the roles of pentoses in DNA...

What are pentoses? What are the roles of pentoses in DNA and RNA molecules? Pentoses are carbohydrates made of five carbons. The DNA molecule is made of a sequence of molecu

Carbon dioxide in the atmosphere, Which part of the carbon cycle is respons...

Which part of the carbon cycle is responsible for the enhancing concentration of carbon dioxide in the atmosphere. The burning of fossilized products (coal and oil) of some pla

What is fluorescent microscope, What is Fluorescent Microscope? In abo...

What is Fluorescent Microscope? In above said microscopes, image is produced from light that passes through a specimen. In fluorescent microscope, however, specimen image is f

Nutrition intervention, Nutrition intervention Nutrition intervention, ...

Nutrition intervention Nutrition intervention, the third step of  the nutrition care process, is a specific set of activities and associated materials used  to address the prob

Define some advantages of breast milk for infants, Define some Advantages o...

Define some Advantages of breast milk for Infants? 1) Breast milk is a simple and natural method of feeding. It is hygienic, inexpensive and available at all times at the righ

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd