What do the colors on the flag of Norway mean? Credit: Thinkstock Images Stockbyte Getty Images. The Union Jack is composed of the flags of three patron saints layered one over the other. The central red cross on a white field is the flag of St. George, the patron saint of England.
Synaptic vesicles contain thousands of neurotransmitter. The  neurotransmitters are packed into a small membrane bound synaptic  vesicles. There are thousands of neurotransm â¦ itter molecules.
Vesicles play many roles within a cell. Since vesicles are composed of a lipid bilayer, they can have a completely self-contained environment that is different from the inside of the cell. There are essentially four types of vesicles used by cells. They are vacuoles, lysosomes, transport vesicles, and secretory vesicles.