What are the functions of exocytosis?

Exocytosis is the process by which cells secrete waste products and other large molecules from the cytoplasm to the exterior of the cell. Exocytosis is also significant for chemical signal messaging, as well as cell-to-cell signaling. The process is essential for the release of neurotransmitters, and cytokines. In addition, many endocrine cells such as those in the adrenal glands use exocytosis to release hormones into the bloodstream, which also act as chemical messengers. Exocytosis is used to regenerate the cell membrane by fusing proteins and lipids removed by endocytosis back into the membrane. Another function is that exocytosis forms vesicles known as transport or secretory vesicles, which are responsible for moving molecules outside the cell. Lastly, exocytosis assists in maintaining cellular homeostasis by allowing cells to regulate the composition of their environment.