Final answer:
Smooth endoplasmic reticulum (SER) is a membrane-bound organelle in the cell's cytoplasm that lacks ribosomes and is involved in various functions such as lipid synthesis, carbohydrate metabolism, calcium ion storage, and detoxification. Unlike the rough endoplasmic reticulum (RER), the smooth endoplasmic reticulum does not have embedded ribosomes.
Step-by-step explanation:
Smooth endoplasmic reticulum (SER) is a vast system of interconnected, membranous, infolded and convoluted tubes located in the cell's cytoplasm. Unlike rough endoplasmic reticulum (RER), SER does not have any ribosomes attached to it, giving it a smooth appearance. SER has multiple functions, including lipid synthesis, carbohydrate metabolism, calcium ion storage, and detoxification of toxic compounds.