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

Explain the objectives of history of mart disease, Explain the OBJECTIVES o...

Explain the OBJECTIVES of history of mart disease? After reading this unit, you should be able to: 1. Understand the importance of Cardio-vascular diseases as the leading cause

Typical signs of hip fracture-shortening, In the case story, Reggie present...

In the case story, Reggie presented with three typical signs of hip fracture-shortening, adduction, and the lateral rotation of the affected limb. What causes these signs? (HINT-th

Food hygiene, as newly appointed food safety manager within a medium seized...

as newly appointed food safety manager within a medium seized

Ant-nutritional factors limiting their optimum use, Ant-Nutritional Factors...

Ant-Nutritional Factors Limiting their Optimum Use The anti-nutritional factors (ANFs) are non-fibrous natural substances which occur as natural constituents of plants and anim

Potassium, Potassium, Calcium, Iron and Magnesium - Microorganism? Thes...

Potassium, Calcium, Iron and Magnesium - Microorganism? These are supplied by inorganic salts and exist in the cell as cations. These perform various functions in the cell like

Explain the disadvantages of fixation, Explain the Disadvantages of Fixatio...

Explain the Disadvantages of Fixation? Fixation has following disadvantages also. These are highlighted herewith: (i) It distorts the cell's appearance. (ii) Motility can

Explain about gestational diabetes mellitus, Q. Explain about Gestational D...

Q. Explain about Gestational Diabetes Mellitus ? During pregnancy, a woman who does not have a history of diabetes, may develop high blood glucose or sugar. This is GDM. The di

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