A vesicle is a small, fluid filled blister. That's all i know, good luck!
A Vesicle is relatively small, intercellular, membrane-enclosed sac that stores or transports substances within a cell.
The vesicle (membrane-bound bubble within the cell) which is formed during the process of endocytosis and which contains substances being imported from outside of the cell. Source: CancerWeb
Serum
The seminal vesicles produce a fluid called semen which is eventually released by the males body.