Class 11 Biology Cell : The Unit of Life Endoplasmic reticulum (ER)

Endoplasmic reticulum (ER)

  • Endoplasmic reticulum is a network or reticulum of tiny tubular structures scattered in the cytoplasm.
  • ER divides the intracellular space into two distinct compartments, i.e., luminal (inside ER) and extra luminal (cytoplasm) compartments.
  • The endoplasmic reticulum bearing ribosomes on their surface is called rough endoplasmic reticulum (RER), whereas in the absence of ribosomes they appear smooth and are called smooth endoplasmic reticulum (SER).
  • RER is involved in protein synthesis and secretion, whereas SER is the major site for synthesis of lipid.


Fig. Endoplasmic reticulum

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