Endoplasmic Reticulum (E.R)
(endo means inner, plasma means fluid and reticulum means network of channels) :- Endoplasmic Reticulum is a network of interconnected channels that extends from cell membrane to nuclear envelope.
Types:- there are two types of endoplasmic reticulum.
Rough Endoplasmic Reticulum (R.E.R):- RER is so named because of its rough appearance due to numerous ribosomes that are attached to it. Due to presence of ribosomes , RER serves a function in protein synthesis.
Smooth Endoplasmic reticulum (S.E.R):- These are smooth in appearance so named SER. These are involved in lipid metabolism and in the transport of materials from one part of cell to another. It also detoxifies harmful chemicals that have entered cell.
Difference between rough and smooth endoplasmic reticulum;-
|Rough Endoplasmic Reticulum||Smooth Endoplasmic Reticulum|
|1) This is granular||Non granular|
|2) RER contain Ribosome||SER contain no Ribosome|
|3) involved in protein synthesis||Involved in lipid formation|
|4) Extends from nucleus to plasma membrane.||Present inner to plasma membrane.|