Cells.

Proteins made from ribosomes attached to the rough endoplasmic reticulum enter the lumen of the ER and move to the smooth endoplasmic reticulum. A small vacuole (vesicle) pinches off the smooth ER and carries the protein to the Golgi apparatus, where it is further processed. --------------------------------------------------- Mitochondria are bounded by a double membrane. The inner membrane is folded to form little shelves, called cristae, which project into the matrix, an inner space filled with a …

…produce steroid hormones. In the liver, smooth ER is involved in the detoxification of drugs, including alcohol. --------------------------------------------------- The Golgi apparatus is composed of a stack of about a half dozen or more saccules (flattened vacuoles, which look like hollow pancakes). One side of the stack, called the inner face, is directed toward the nucleus and the ER. The other side of the stack, called the outer face, is directed toward the cell membrane. ---------------------------------------------------