Which organelle is involved in the synthesis of lipids?

The smooth endoplasmic reticulum (SER) is primarily responsible for lipid synthesis in cells. Unlike the rough endoplasmic reticulum, which has ribosomes on its surface and is involved in protein synthesis, the smooth endoplasmic reticulum lacks these ribosomes, giving it a smooth appearance. The SER plays a crucial role in synthesizing fats, phospholipids, and steroids, all of which are vital components of cell membranes and hormones.

Additionally, the smooth endoplasmic reticulum is involved in the metabolism of carbohydrates and detoxification of drugs and poisons in the liver. This multifunctionality of the SER highlights its important role in cellular metabolism and homeostasis. Its structure, comprising a network of tubular membranes, contributes to its ability to produce and transport lipids efficiently within the cell.