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Structure of a Cell - Endoplasmic Reticulum (ER)

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notes

Endoplasmic Reticulum:

  • The endoplasmic reticulum (ER) is a large network of membrane-bound tubes and sheets. It looks like long tubules or round or oblong bags (vesicles).

  • There are two types of ER –

    • Rough endoplasmic reticulum (RER)

    • Smooth endoplasmic reticulum (SER).

  • RER has ribosomes attached to its surface which are sites of protein synthesis.

  • SER helps in the manufacture of fat molecules, or lipids, important for cell function.

  • Membrane biogenesis - Some of these proteins and lipids help in building the cell membrane. This process is known as membrane biogenesis.

  • It always forms a network system. It serves as serve as channels for the transport of materials (especially proteins) between various regions of the cytoplasm or between the cytoplasm and the nucleus.

  • The ER also functions as a cytoplasmic framework providing a surface for some of the biochemical activities of the cell. Eg. SER also helps in detoxification.

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