What is the main function of endoplasmic reticulum?

The endoplasmic reticulum (ER) has two main types with different primary functions:Rough Endoplasmic Reticulum (RER):- Protein synthesis and modification - Ribosomes attached to its surface produce proteins- Protein folding - Ensures proteins achieve their correct 3D structure- Quality control - Identifies and helps repair misfolded proteins- Transport - Packages proteins for shipment to the Golgi apparatusSmooth Endoplasmic Reticulum (SER):- Lipid synthesis - Produces phospholipids and cholesterol- Detoxification - Breaks down drugs and poisons in liver cells- Calcium storage - Important for muscle contraction signaling- Steroid hormone production - Especially in endocrine cellsThink of the ER as the cell's manufacturing and packaging system - the rough ER handles protein production while the smooth ER specializes in lipids and detoxification.