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Which cells of the nervous system outnumber neurons by roughly ten to one?
AGlial cells, which support and insulate neurons
BSensory receptors found in the skin and eyes
CRed blood cells circulating within the brain
DEndocrine cells that release hormones locally
Answer & Solution
Correct answer: A. Glial cells, which support and insulate neurons
1. The nervous system is built from two basic cell types, glial cells and neurons.
2. The chapter states that glia outnumber neurons about ten to one.
3. Their roles include forming scaffolding, insulating neurons, transporting nutrients and waste, and mediating immune responses.
4. Neurons themselves are described as roughly 100 billion strong at birth, so they are numerous but still the smaller population.
_Source: OpenStax Psychology (1st ed., CC BY 4.0), Ch 3 "Biopsychology", §3.2 Cells of the Nervous System_
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