Cellular & Molecular Medicine: Open access

Exocytosis is an active and proliferative pathway in which the cell migrates molecules (e.g. neurotransmitters and proteins) to the outside of the cell (exo- + cytosis) by delivering them through a process that supports energy. Exocytosis and its counterpart, endocytosis, are used in all cells because many of the chemical elements that are important to them are large polar particles that can pass through the hydrophobic part of the cell membrane in dark ways. Exocytosis is in the process of releasing many molecules, making it a viable means of transport.

In exocytosis, vesicles that are bound to the cervix are transported to this cell wall, and their contents (e.g., water molecules) are transported to the outer surface. This secretion is possible because the vesicle interacts slightly with the plasma membrane. In the context of neurotransmission, neurotransmitters are usually released from synaptic vesicles entering the synaptic cleft via exocytosis; however, neurotransmitters can be released by backward movement of the membrane transport proteins.