Endoplasmic reticulum is a cell organelle and presents in eukaryotes. The main function of endoplasmic reticulum is that it transports protein in the cell. Endoplasmic reticulum helps to interconnect the tubular network. It stores different minerals for the cell. It helps in cell's transport system and carries materials from one part to the other part of the cell. Moreover, ribosomes are present on the surface of endoplasmic reticulum, which help in the synthesis of protein.
Endoplasmic Reticulum is one of the cell organelle. While the function of the nucleus is to act as the brain of the cell, the function of the ER is to act as packaging system. It does not works alone.It works closely with golgi apparatus, ribosomes, RNA, mRNA, tRNA .It creates a network of membranes found through the whole cell. The ER may also look different from cell to cell, depending on the cell's function. There are two types of ER present in the cell. One is rough ER and another is smooth ER.They both have the same types of membranes but they have different shapes and rough ER has ribosomes attached. Rough ER looks like sheets of bumpy membranes while smooth ER looks more like tubes. Sometimes the ER looks like a flat balloon. Sacs of the ER called cisternae store the complex molecules. Smooth ER has its purpose in the cell. It acts as a storage organelle. It is important in the creation and storage of steroids. It also stores ions in solution that the cell may need at a later time. Steroids are a type of ringed organic molecule used for many purposes in an organism. They are not always about building muscle mass like a weight lifter. The ion storage is important because sometimes a cell needs ions fast. It might not want to search the environment for ions, so it is easier to have them stored in a pack for easy use. Rough ER was mentioned in the section on ribosomes. They are very important in the synthesis and packaging of proteins. Some of those proteins might be used in the cell and some are sent out. The ribosomes are attached to the membrane of the ER. As the ribosome builds the amino acid chain, the chain is pushed into the ER. When the protein is complete, the rough ER pinches off a vesicle. That vesicle, a small membrane bubble, can move to the cell membrane or the Golgi apparatus.
