Exocytosis

Definition

Exocytosis is a cellular process where cells transport molecules out of the cell by vesicles fusing with the plasma membrane and releasing their contents into the extracellular space. This process is essential for the secretion of substances produced by cells, such as hormones and neurotransmitters.

Related terms

Endocytosis: The process by which cells take in external substances by engulfing them in a membrane, opposite to exocytosis.

Vesicle: A small structure within a cell, consisting of fluid enclosed by a lipid bilayer, used to transport materials within the cell.

Plasma Membrane: The biological membrane that separates the interior of all cells from the outside environment, regulating passage of substances in and out of cells