Intracellular Vesicles

Sometimes cells need to transport small amounts of material, like specific molecules. The process of surrounding small quantities of material, either from outside the cell or from some organelle is called pinocytosis. The small sacs that carry such material are called vesicles.

One example of vescicle use is the formation of vesicles at the boundaries of the endoplasmic reticulum to transport specific molecules like proteins to the Golgi complex for distribution.