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

What do you mean by taenia solium or taenia saginata, Q. If a person eats r...

Q. If a person eats raw or badly cooked meat infected by Taenia solium or Taenia saginata will this person develop taeniasis or cysticercosis? If a person eats badly cooked or

What is a bio regenerative system, What is a bio regenerative system? Why i...

What is a bio regenerative system? Why is it essential? Nutritional requirements for long flights have been refined, placing more demands on food development. Despite the techn

HEALTHY DIET, EXPLAIN THE CONSTITUENT OF FOOD GROUPS AND THEIR SOURCES

EXPLAIN THE CONSTITUENT OF FOOD GROUPS AND THEIR SOURCES

Population parameters and regulation, Population Parameters and Regulation ...

Population Parameters and Regulation Population can be defined as a group of organisms of same species occupying a specific area at a particular time, such as all the deer or

What are the main types of waste, What are the main types of waste? The...

What are the main types of waste? The waste can be classified into main types, each of them carrying its own dissimilar environmental problem: organic waste, non recyclable was

Special situations of pulmonary embolism, Q. Special situations of Pulmonar...

Q. Special situations of Pulmonary Embolism? The CXR is often abnormal in pulmonary embolism. Atelectasis and other focal pulmonary parenchymal abnormalities are the most commo

What is cerebral hemorrhage, What is Cerebral Hemorrhage Cerebral hemor...

What is Cerebral Hemorrhage Cerebral hemorrhage is a massive bleeding into the substance of the brain. The most frequent cause is high blood pressure, or hypertension. Other ca

Explain anaerobic nitrogen-fixer, One of the free-living, anaerobic nitroge...

One of the free-living, anaerobic nitrogen-fixer is: 1. Beijernickia 2. Rhodospirillum 3. Rhizobium 4. Azotobacter Rhodospirillum

What are the epithelial tissues, Q. What are the epithelial tissues? What i...

Q. What are the epithelial tissues? What is their general function and how is that function associated to the features of the tissue? Epithelial tissues also called as epitheli

Roles of abscisic acid, Roles of Abscisic Acid Abscisic acid (ABA) is ...

Roles of Abscisic Acid Abscisic acid (ABA) is a particularly interesting hormone with regard to the regulation of its own levels. Its levels rise and fall dramatically in seve

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