What is the function of the rough endoplasmic reticulum?

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The rough ER is the part of the endoplasmic reticulum that is covered in ribosomes, which gives it its rough appearance. The rough ER is responsible for membrane production and is the site of protein synthesis.
The smooth endoplasmic reticulum is responsible for the detoxification and metabolism of multiple molecules. Its other functions include synthesis of carbohydrates, lipids, and steroid hormones; and the storage of calcium ions used for muscle contraction.
Mitochondria are the site of cellular respiration.
Lysosomes are the digestive system of the cell. Lysosomes contain hydrolytic enzymes which allow them to hydrolyze (break down) proteins, fats, sugars, and nucleic acids taken into the cell as well as break down other worn out organelles within the cell. Lysosomes contain an acidic environment with a pH of around 4.5.
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What Is the Function of the Rough Endoplasmic Reticulum