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endoplasmic reticulum
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endoplasmic reticulum Article

What is the endoplasmic reticulum?

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  • The endoplasmic reticulum (ER) is a continuous membrane system that forms a series of flattened sacs within the cytoplasm of eukaryotic cells.
  • All eukaryotic cells contain an ER.
  • In animal cells, the ER usually constitutes more than half of the membranous content of the cell.
  • The ER can be classified in two functionally distinct forms: the smooth endoplasmic reticulum (SER) and the rough endoplasmic reticulum (RER).

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