Endoplasmic reticulum, Biology

Assignment Help:

ENDOPLASMIC RETICULUM (ER)

Eucaryotic celIs have two major compartments- nucleus and cytoplasm. Cytoplasm was known to have no structure until the discovery of electron micrsscope. That cytoplasm is permeated by a membranous network called endoplasmic reticulum (ER), was revealed only after the introduction of electron microscope. Endoplasmic reticulum is a three dimensional network of membrane channels which constitutes more than half of the total membrane of the cell, ER is a highly folded and convoluted structure and forms a single continuous sheet enclosing one continuous sac. The interior of the sac is called "cisternal space" or "ER lumen". This is separated from the cytoplasm also called cytosol by a single membrane which mediates the communication between these two compartments. ER provides the cell with a compartment for storage of substances to be kept separate from cytosol. In addition, it has a key role in the biosynthesis of macromolecules.

ER is a double membranous organelle which consists of interconnecting flattened sacs called cisternae or interconnected tubules or vesicles. Cisternae are temporary storage sites for nutrients (Figure shown below).

 

527_endoplasmic teticulum.jpg


Related Discussions:- Endoplasmic reticulum

Guidelines for the family members for healthy coping, Q. Guidelines for the...

Q. Guidelines for the Family Members for Healthy Coping? - Patient and the family members should discuss the situation, change in role,time distribution, share of money and oth

What are extraembryonic membranes, What are extraembryonic membranes? E...

What are extraembryonic membranes? Extraembryonic membranes are membranous structures that appear in parallel with the embryo and play significant roles in the embryonic develo

Conditions required for mimicking pericardial effusion, Q. Conditions requi...

Q. Conditions required for Mimicking Pericardial Effusion? In 2DE few conditions can mimic PE. a) Pericardial fat-Mostly localized anteriorly. Absence of fat in the posterio

What do you understand by compound eye, What do you understand by Compound ...

What do you understand by Compound eye? The characteristic eye of the Arthropoda. It comprise many ommatidia, the basic optical unit of compund eye, grouped together to form th

Molecular biology, how biochemical evidence proof DNA as a genetic material...

how biochemical evidence proof DNA as a genetic material?

Describe oxidative stress in new cardio-vascular, Describe Oxidative Stress...

Describe Oxidative Stress in New Cardio-vascular Risk Factors ? In the risk conferred by LDL cholesterol, the oxidative modification of LDL plays a central role, because it is

Explain starch gelatinization, Starch gelatinization Undamaged starch ...

Starch gelatinization Undamaged starch granules are insoluble in cold water but can imbibe water  reversibly i.e. they can swell slightly and then return to their original siz

Explain about the vacuum evaporators, Explain about the Vacuum Evaporators?...

Explain about the Vacuum Evaporators? It is common to construct various vacuumised vessels in series that is why the product moves from one vacuum chamber to the next and thus

Systemic emboli, Osler's nodes are small, tender subcutaneous nodules that ...

Osler's nodes are small, tender subcutaneous nodules that develop in the pulp of the digits or occasionally more proximally in the fingers and persist for hours to several days. Th

Requirements of glutamine in diverticular disease, Q. Requirements of Gluta...

Q. Requirements of Glutamine in diverticular disease? Glutamine: Wile specific nutrients that may have an impact on diverticula disease have not been studied as thoroughly as t

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