Acetylcholine
A
neurotransmitter secreted by motor neurons. When an impulse arrives
at the knobs in the axon branches of a motor neuron, a
neurotransmitter is released from the synaptic vesicles.
Neurotransmitters are chemical substances that diffuse across the
synaptic gap and initiate a second impulse when chemoreceptors on
the dendrites are stimulated. Cholinergic cells secrete the
neurotransmitter, acetylcholine. Adrenergic cells secrete the
neurotransmitter, epinephrine.
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