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Definition and Functions of the Endoplasmic Reticulum

Suara.com – Retikulum endoplasma (ER), in Biology, a continuous membrane system that forms a series of flattened sacs in the cytoplasm of eukaryotic cells and serves many functions. One of endoplasmic reticulum function is for protein transport.

All eukaryotic cells contain an endoplasmic reticulum (ER). In animal cells, the ER usually constitutes more than half the contents of the cell membrane. Certain differences in physical and functional characteristics distinguish the two types of ER, which are known as rough ER and smooth ER.

Well, in this article will be explained more about endoplasmic reticulum function. Here’s the explanation quoted from US National Library of Medicine National Institutes of Health.

Definition of Endoplasmic Reticulum

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The Endoplasmic Reticulum is a large dynamic structure that has many roles in the cell including:

  1. store calcium
  2. protein synthesis
  3. lipid metabolism

The ER is the largest organelle in the cell and is the main site of:

  1. protein synthesis and transport
  2. protein folding
  3. synthesis of lipids and steroids
  4. carbohydrate metabolism
  5. calcium storage

The multi-functional nature of this organelle requires a myriad of proteins, unique physical structures and coordination with and response to changes in the intracellular environment. The ER consists of several distinct structural domains, each of which is associated with a specific function or functions.

Endoplasmic Reticulum (ER) Function

The most important functions of the endoplasmic reticulum are especially in:

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  • synthesis
  • folding
  • modification
  • protein transport

Differences in certain physical and functional characteristics distinguish two types of ER, known as rough ER (RER) and smooth ER (SER).

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