Final answer:
The smooth ER plays a vital role in synthesizing lipids, detoxification, regulating calcium ions, and participating in metabolic processes.
Explanation:
The primary role of the smooth ER (endoplasmic reticulum) includes synthesizing lipids, phospholipids, steroids, and carbohydrates, detoxification of toxins, regulating calcium ion concentration in muscle cells, and metabolizing carbohydrates. It also stores calcium ions and plays a crucial role in various metabolic processes.
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