Question

what is endoplasmic reticulum​

Answer 1

The endoplasmic reticulum is, in essence, the transportation system of the eukaryotic cell, and has many other important functions such as protein folding. It is a type of organelle made up of two subunits – rough endoplasmic reticulum, and smooth endoplasmic reticulum.

The endoplasmic reticulum (ER) is a large, dynamic structure that serves many roles in the cell including calcium storage, protein synthesis and lipid metabolism. The diverse functions of the ER are performed by distinct domains; consisting of tubules, sheets and the nuclear envelope.

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Answer 2

Question:-

What is endoplasmic reticulum?

Answer:-

Endoplasmic Reticulum is three-dimensional networks of intracellular membranes. It is present in all eukaryotic cells. In young meristematic cells, ER is very much developed. In spermatocytes, ER is represented by a few vacuoles. Cells actively synthesizing proteins like liver, fibroblast and pancreatic cells have abundant ER.

ER is formed of three types of elements:

1.Cisternae

2.Tubules

3.Vesicles

Now, explanation of three elements:

$\bigstar$ Cisternae:

$\longmapsto$ They are sacs like unbranched structures.

$\longmapsto$ It lies in stacks or piles parallel to each other. These cisternae in the stack are interconnected with each other.

$\longmapsto$ Cisternae contain transmembrane Glycoprotein Ribophorin 2, they bind with larger subunits of the ribosome.

$\bigstar$ Tubules:

$\longmapsto$ These are irregular branched tubular structures.

$\longmapsto$ They form a network along with other elements.

$\bigstar$ Vesicles:

$\longmapsto$ These are oval, rounded vacuole-like elements.

$\longmapsto$ It is often isolated in the cytoplasmic matrix.

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