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- What are the major subdivisions of the autonomic nervous system? - It is divided into the sympathetic and the parasympathetic nervous
systems. - What is the major neurotransmitter of the parasympathetic autonomic
nervous system? - Acetylcholine (ACh). ACh is released in- to the synaptic clefts from the
pre-and the postsynaptic neurons of the parasympathetic nervous system.
- In the sympathetic nervous system, what neurotransmitter is released from the pregan- glionic neuron into the synaptic cleft?
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