Endoplasmic reticulum




The endoplasmic reticulum of eukaryotic cells is found in the cytoplasm. It is part of the membranous cytoplasmic vacuolar system and forms the largest part of this system. It is flattened and consist of vesicles and cisternae. It is bounded by a unit membrane similar in structure to the cell membrane proper. It is connected to the cell membrane proper (plasma membrane) and the nuclear membrane. It therefore forms a system of transportation of bulky materials, electrical impulses and chemical substances within the cell. It is divided into two types

  • Rough endoplasmic reticulum which contains numerous ribosomes. It is found mostly in protein secreting cells

  • Smooth endoplasmic reticulum which is devoid of ribosomes and is found in lipid producing or steroidogenic cells.

Smooth endoplasmic reticulum


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