MICROANATOMY

Detailed explanation-1: -Proteins are sorted into the regulated secretory pathway in the trans Golgi network, where they are packaged into specialized secretory vesicles. These secretory vesicles, which are larger than other transport vesicles, store their contents until specific signals direct their fusion with the plasma membrane.

Detailed explanation-2: -Proteins synthesized in the ER are packaged into vesicles, which then fuse with the Golgi apparatus. These cargo proteins are modified and destined for secretion via exocytosis or for use in the cell.

Detailed explanation-3: -Answer and Explanation: The organelle that packages proteins before they leave the cell is the Golgi apparatus. The Golgi apparatus will receive proteins from the endoplasmic reticulum via its cis face, and then package them and modify them in various ways.