List the two major divisions of the nervous system and what they consist of:

Structural Divisions of the Nervous System. The nervous system can be divided into two major regions: the central and peripheral nervous systems. The central nervous system (CNS) is the brain and spinal cord, and the peripheral nervous system (PNS) is everything else

Explanation:

The nervous system can be divided into two major regions: the central and peripheral nervous systems. The central nervous system (CNS) is the brain and spinal cord, and the peripheral nervous system (PNS) is everything else

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i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.