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Briefly explain why the following terms are sometimes used to refer to the autonomic nervous system: involuntary nervous system and emotional-visceral system.
14. The Autonomic Nervous System
Introduction to the Autonomic Nervous System
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All preganglionic autonomic fibers release______at their axon terminals, and the effects are always_____. (a) norepinephrine, inhibitory, (b) norepinephrine, excitatory, (c) acetylcholine, excitatory, (d) acetylcholine, inhibitory.
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