Here's why:
* The Golgi apparatus is a stack of flattened, membrane-bound sacs called cisternae.
* Proteins and lipids synthesized in the endoplasmic reticulum (ER) are transported to the Golgi apparatus.
* Within the Golgi, these molecules are further processed, modified, sorted, and packaged into vesicles.
* These vesicles then transport the packaged secretions to their destination, either inside or outside the cell.
Think of the Golgi apparatus like a cellular post office: It receives, sorts, packages, and sends out "packages" of molecules!
