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.
In the synaptic region, the plasma membrane of the presynaptic cell is specialized for vesicle exocytosis; synaptic vesicles, which contain a neurotransmitter, are clustered in these regions. The opposing membrane of the postsynaptic cell (in this case, a neuron) contains receptors for the neurotransmitter. Figure 21-30, Lodish 4th edition. Micrograph of an axon terminal obtained by the rapid-freezing deep-etch technique.