Final answer:
Aging leads to a decrease in nervous system activity due to structural changes in the brain and hormonal alterations.
Explanation:
With aging, there is a decrease in nervous system activity in the brain and spinal cord due to shrinkage of neurons, lower number of synapses, and shorter length of axons. As we age, the brain experiences structural changes such as cell loss, myelination loss, and synapse loss, leading to functional declines. Additionally, hormonal changes and decreased hypothalamic regulation play a role in age-related metabolic issues.
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