Which of the following statements about the parasympathetic nervous system is true?Group of answer choicesOne neuron carries information from the central nervous system to the target cells in the parasympathetic nervous system.The parasympathetic nervous system innervates skeletal muscles.The parasympathetic nervous system controls the fight-or-flight response.The parasympathetic nervous system uses norepinephrine as its sole neurotransmitter.The parasympathetic nervous system leaves the central nervous system via the cranial nerves and sacral spinal nerves.
Question
Which of the following statements about the parasympathetic nervous system is true?Group of answer choicesOne neuron carries information from the central nervous system to the target cells in the parasympathetic nervous system.The parasympathetic nervous system innervates skeletal muscles.The parasympathetic nervous system controls the fight-or-flight response.The parasympathetic nervous system uses norepinephrine as its sole neurotransmitter.The parasympathetic nervous system leaves the central nervous system via the cranial nerves and sacral spinal nerves.
Solution
The true statement about the parasympathetic nervous system is: "The parasympathetic nervous system leaves the central nervous system via the cranial nerves and sacral spinal nerves."
Here's why:
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It's not true that one neuron carries information from the central nervous system to the target cells in the parasympathetic nervous system. In fact, two neurons are involved in this process: the preganglionic neuron and the postganglionic neuron.
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The parasympathetic nervous system does not innervate skeletal muscles. It primarily innervates smooth muscles, cardiac muscles, and glands.
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The parasympathetic nervous system does not control the fight-or-flight response. This is the role of the sympathetic nervous system.
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The parasympathetic nervous system does not use norepinephrine as its sole neurotransmitter. It primarily uses acetylcholine.
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The parasympathetic nervous system does indeed leave the central nervous system via the cranial nerves and sacral spinal nerves. This is a characteristic feature of the parasympathetic nervous system, distinguishing it from the sympathetic nervous system, which leaves the CNS from the thoracic and lumbar regions.
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