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 po- are the major subdivisions of the autonomic nervous system? - It is divided into the sympathetic and the parasympathetic nervous

systems. - What is the