Which of the following functions are performed by the Smooth endoplasmic reticulum? ✔ 1. Synthesis of lipids ✔ 2. Glycogenolysis ✔ 3. Sterol metabolism ✔ 4. Detoxification

📌 Concept:
Endoplasmic reticulum: The network or reticulum of tiny tubular structures scattered in the cytoplasm is called the endoplasmic reticulum (ER).
The ER divides the intracellular space into two distinct compartments, i.e., luminal (inside ER) and extraluminal (cytoplasm) compartments.
The ER is of two types based on the presence or absence of ribosomes on its surface.
The Endoplasmic reticulum bearing ribosomes on their surface is called Rough Endoplasmic Reticulum (RER) whereas in the absence of the ribosomes they appear smooth and are called Smooth Endoplasmic Reticulum (SER).
Rough Endoplasmic Reticulum (RER) in the cells actively involved in the Synthesis of protein and secretion.
The main function of Smooth Endoplasmic Reticulum (SER) includes transport of materials, Synthesis of lipid, and Synthesis of hormones.

• ​Explanation:
The smooth endoplasmic reticulum (smooth ER) is a membranous organelle found in most eukaryotic cells. Its functions include 
Synthesis of Lipids, including cholesterol and phospholipids.
Steroid Hormones.
Storage and metabolism of calcium ions within the cell.
Detoxification of harmful metabolic byproducts/toxic substances.
Glycogenolysis i.e the breakdown of the molecule glycogen into glucose.