smic RETICULUM (ER) :The endoplasmic reticulum is a large network of membrane-bound TUBE's and sheets.It looks like long tubles or ROUND or oblong bags.The ER membrane is similar in structure to the plasma membrane.Types of Endoplasmic reticulum :There are Two types of ER-Rough endoplasmic reticulum (RER)Smooth Endoplasmic reticulum (SER)Rough Endoplasmic reticulum (RER) :RER looks rough due to the PRESENCE of ribosomes on its surface.RER helps in PROTEINS synthesis.Smooth endoplasmic reticulum (SER) :SER looks smooth because ribosomes are not attached to its surface.SER helps in the synthesis of fats and lipids.Biogenesis :Fats and lipids are manufactured by smooth endoplasmic reticulum which helps in building the cell membrane.This process is known as Biogenesis.Functions of Endoplasmic Reticulum :It serves as a channel for the transport of materials between various region's of the cytoplasm.It also functions as a cytoplasmic framework providing a surface for biochemical activities.It also helps in detoxifying many poisons and drugs.