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Each axon terminal contains thousands of membrane-bound sacs called vesicles, which in turn contain thousands of neurotransmitter molecules each. Neurotransmitters are chemical messengers which relay, amplify and modulate signals between neurons and other cells.
To do this, the impulse triggers the release of a transmitter chemical (such as serotonin) from the end of the neurone into the synapse. 3. These transmitter chemical molecules diffuse across the gap between the two neurones, and bind to special receptor molecules on the membrane (outer skin) of the next neurone.4.erotonin is a 'transmitter' chemical-it helps to pass nerve impulses from one nerve cell (neurone) to the next over the synapse (gap between two neurones). It works like this; 1. When a nerve impulse travels the length of a neurone and reaches the end it must 'jump' the gap between one neurone and the next. 2.