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In addition, the neurotransmitter can bind to any one of the nearby smooth muscle cells, a flexibility not found in the NMJ. The chemicals that influence smooth muscle cells: As you'll recall, there is only one neurotransmitter released at the neuromuscular junction-acetylcholine.
ACh, which binds to nicotinic receptors, is the neurotransmitter at these sites as found in the other autonomic ganglia. Postganglionic sympathetic fibers then travel from the prevertebral ganglia to innervate tissues such as blood vessels where they release norepinephrine as the primary neurotransmitter.