|Transmitter chemical| is housed in the sac-like synaptic vesicles within the synaptic knob at the |axon| terminal. This neurotransmitter, such as acetylcholine, is released when triggered by a ~nerve~ impulse from the neuron. The |transmitter chemical| is released into the synaptic space, or cleft, and allows sodium ions to be transported across the membrane to the |muscle fibers|.
