Question
What is endoplasmic reticulum? Write its main functions.
Solution
Endoplasmic Reticulum is a membranous network, enclosing a fluid-filled lumen. Its main functions are:
(i) Synthesis of proteins (Rough ER)
(ii) Synthesis of lipids and their secretion (SER).
(iii) Secretion of enzymes and hormones inside the cell or when secreted out of the cell.
(iv) ER also produces substance for new cellular parts (especially cell membrane).
(v) ER provides internal support (mechanical support) to the cell.
