Smooth E.R. and Rough E.R.

Timmy Mudlock

Stanley (Zane) Stelevich

Endoplasmic Reticulum

Diagram

TEM of a rough E.R.

Smooth E.R.

Pictures

Rough E.R.

Structure of Endoplasmic ReticulumRough E.R.is a network of tubules,

vesicles and sacs that are interconnected

endoplasmic reticulum which gets its name from the presence of ribosomes on its surface

Rough ER looks like sheets of bumpy membranes

Smooth E.R.Smooth endoplasmic

reticulum is a small part of the endoplasmic reticulum, but is very prominent in some cells, like, those in the liver, adrenal cortex, and muscles.

smooth ER looks more like tubes

The lumen of the endoplasmic reticulum (ER) is the area enclosed by the endoplasmic reticulum membrane, an extensive network of membrane tubules, vesicles and flattened cisternae (sac-like structures) found throughout the eukaryotic cell, especially those responsible for the production of hormones and other secretory products.

Lumen

The roughness is caused because of ribosomes on the surface

is the production and processing of specific proteins at ribosomal sites that are later exported.

creation of two types of proteins. One is the type which fortifies and gets embedded into the

reticulum membrane. The other types are water soluble membranes, which, after

creation at ribosomal sites, pass through the membrane and into the lumen.

is to transport these ready proteins to the sites where they are required.

They may also be sent to the Golgi bodies for further advanced processing, through vesicles.

Functions of Rough E.R.

is an important animal, as well as plant cell organelle

It takes part in several metabolic processes, besides providing surface area for the action of the enzymes.

It also serves as storage space for several important enzymes.

Among the various metabolic processes, smooth endoplasmic reticulum plays an important role in carbohydrate metabolism and synthesis of lipids and steroids.

Functions of Smooth E.R.