Class 9 Biology Fundamental Unit of Life Endoplasmic reticulum

Endoplasmic reticulum

The large network of membranous sheets and tubes is called endoplasmic reticulum.

They are filled with fluids and carries materials throughout the cell due to which it is also called transport system of the cell.

It transports materials between the regions of cytoplasm or between the cytoplasm and nucleus.

It also provides a surface for some biochemical activities of cell.

It can be classified into two types:

  • RER (Rough Endoplasmic Reticulum)
  • SER (Smooth Endoplasmic Reticulum)

Fig. Endoplasmic reticulum

The RER appears rough under a microscope as it is lined with ribosomes.

The ribosomes manufactures the proteins which are then transported throughout the cell by the Endoplasmic Reticulum.

The SER appears smooth uner microscope due to absence of ribosomes. It also manufactures fat molecules or lipids that are important for proper functioning of cell and detoxyfies the poisons present in liver cells of vertebrates.

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