Question

Write structure and function of Endoplasmic Recticulum (ER)????

Answer 1

$\underline{\rm\pink{Endoplasmic \:Reticulum - }}$

$\implies$It was discovered by Porter and Thompson (1945) and the name endoplasmic reticulum was given by Porter.

$\implies$It is found in plamodesmata in the form of desmotubules.

$\implies$The membrane of enoplasmic reticulum is 50 - 60 A° thick.

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$\underline{\rm\red{Structure : }}$

It is a 3 dimensional and interconnected system of membrane lined channels that run through the cytoplasm, forms network. It divides the intercellular space into laminal ( inside ER ) and extra luminal ( cytoplasm ) compartments.

It is found in three forms -

$\implies$Cisternae - They are flat interconnected sac - like structures.

$\implies$Vesicles - They are oval or rounded sacs.

$\implies$Tubules - They are tube like extensions that connect cisternae and tubules.

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$\underline{\rm\red{Function :}}$

$\implies$ER increases the surface area of the cytoplasm for various metabolic activities of the cell.

$\implies$It gives internal support to the collodial matrix ( cytoplasm ).

$\implies$It functions as an intracellular transport system for various substances.

$\implies$Materials synthesized can be stored in different parts of ER.

$\implies$Protein synthesis occurs on the surface of the rough ER by ribosomes. These proteins are either used within the cell or exported outside the cell.

$\implies$Synthesis of lipids in collaboration with Golgi body occurs on the surface of smooth ER.

$\implies$Smooth ER helps in the synthesis of sex hormones like testosterone in the testis and estrogens in ovary.

$\implies$Many membranous cell organelle are co - ordinated in their functions like ER , GB , Lysosome and vacuole so they are considered together as endo membranous system.

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Answer 2

$\Large\bf\underline\red{Endoplasmic Reticulum}$

It is one of the main cell organelles. It is a network network of membranes.

It is basically divided into two parts:-

$\boxed{\fcolorbox{white}{pink}{Rough Er}}$

$\boxed{\fcolorbox{white}{pink}{Smooth Er}}$

The structure of Endoplasmic Reticulum is:-

⟾The ER (Endoplasmic Reticulum) is large in structure.

⟾It can serve many roles in the cells.

⟾It forms series of sacs in flattened way inside the cytoplasm of the eukaryotic cells.

The functions of the Endoplasmic Reticulum are:-

⟾It is a network of membranes

⟾It provides channels for transport of materials in a cell.

⟾The Rough ER plays a vital role in sythesis of Protein.

⟾The Smooth ER help in the synthesis of fats.