https://i2.wp.com/www.sciencebold.com/wp-content/uploads/2011/11/er-smooth-2.jpg?fit=800%2C680 680 800 admin http://www.sciencebold.com/wp-content/uploads/2016/07/Untitled-300x114.png admin2011-11-28 02:31:002016-07-26 13:23:08Endoplasmic reticulum
The term “endoplasmic reticulum” was introduced by Porter and Kollman (1952) and developed by Palade and Porter (1954). It is found in almost all plants and animals except prokaryotes.
This is a complex system of flattened sac like vesicles (cisternae). Two distinct types of endoplasmic reticulum are recognized, both found in same cell. Rough or granular endoplasmic reticulum is associated with particles called ribosome, which are attached to the outer surface cisternae membranes. Smooth endoplasmic reticulum gives this granular appearance and is not associated with ribosome. The form and extent of the endoplasmic reticulum varies greatly according to the function, state or age of the cell.
Functions of endoplasmic reticulum
Endoplasmic reticulum is primarily concerned with the secretion and synthesis of certain chemicals. It also transports and brings distribution of substances uniformly in the cytoplasm. It has been shown that the ribosomes attached to the endoplasmic reticulum are chief sites for the protein synthesis in the cytoplasm.