What is Endoplasmic Reticulum?

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Ned
What is Endoplasmic Reticulum (ER) ?
easylearningwithned.blogspot.com/2022/11/what-is-endoplasmic-reticulum-er.html
The Endoplasmic Reticulum consists of interconnected membranous cisternae ,
tubules and isolated vesicles . It present in almost all eukaryotic cells but it does not
present in prokaryotic cells . The endoplasmic reticulum helps in the exchange of
materials between the cytoplasm and the nucleus . Their are the two types of
endoplasmic reticulum :-
1) Smooth Endoplasmic Reticulum (SER)
2) Rough Endoplasmic Reticulum (RER)
-> Smooth Endoplasmic Reticulum (SER):- It consist tubules and vesicles . Smooth
ER is free of ribosomes . It is present near to the cell membrane . SER takes part in the
synthesis of lipids, glycogen and steroids .
-> Rough Endoplasmic Reticulum (RER) :- It mainly consist of cisternae . In RER , it
bears ribosomes on its cytoplasmic surface . It is present deep in the cytoplasm . RER
takes part in the synthesis of proteins.
Common Functions of Endoplasmic Reticulum :-
1) The Endoplasmic reticulum helps to transport the material from one part of cell to
another part of cell .
2) The Endoplasmic Reticulum offers extensive surface for synthesis of a variety of
materials.
3) It provide the space for temporary storage of synthetic products such as glycogen .
Reference book- Pradeep's Biology Text Book .

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