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.
Ch.5: Synaptic Activity. Introduction. 1  Otto Loewi studied the heart of the frog, which-like our own hearts-is supplied by two different peripheral nerves. 2  One, the sympathetic nerve, excites the heart and makes it beat more rapidly; the other, the vagus, shows the heart. The influx of calcium during depolarization of the endfoot appears to activate a system of microtubules within the endfoot. 2  The microtubules exert mechanical force and induce the movement of vesicles toward the presynaptic membrane. 3  The vesicles then eject neurotransmitter into the synaptic cleft.