The smooth endoplasmic reticulum primarily functions in lipid synthesis and the detoxification of drugs. It produces essential lipids and plays a vital role in calcium ion storage. Through its functions, the SER supports various cellular activities, particularly in muscle contraction and membrane formation. ;
The function of the smooth endoplasmic reticulum is primarily lipid synthesis, along with roles in detoxification and calcium storage. Therefore, the correct answer is A. Lipid synthesis.
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