The following images attempt to illustrate
the major events involved in the constitutive secretion of proteins that travel through the Golgi apparatus on their way to the plasma membrane of the cell. Clicking on each of the
thumbnail images will bring up a larger, labeled version of the
see the Flash movie for the following sequence of images,
Proteins from the endoplasmic reticulum must pass through the Golgi apparatus before they be constitutively secreted.
Secretory vesicles leave the Golgi and merge with the plasma membrane, releasing their cargo outside the cell, by a process called exocytosis.
White blood cells use constitutive secretion to release interleukins, a kind of signaling protein.