What functions does the smooth endoplasmic reticulum perform?

The smooth endoplasmic reticulum (SER) is primarily involved in the synthesis of lipids and the detoxification of drugs and poisons. Unlike the rough endoplasmic reticulum, which is studded with ribosomes and plays a key role in protein synthesis, the smooth endoplasmic reticulum lacks these ribosomes, making it specialized for lipid production. This includes phospholipids and cholesterol, which are crucial for cell membrane formation and maintenance.

Additionally, the SER is equipped with enzymes that help metabolize carbohydrates and detoxify potentially harmful chemicals, which is particularly important in liver cells. These functions are vital for maintaining cellular health and homeostasis. Its role in lipid synthesis and detoxification is why the correct answer is centered on those specific functions.