Q: What is not a function of cerebrospinal fluid?  

Answer: B

Cerebrospinal fluid (CSF) is a clear and colorless liquid that circulates throughout the brain and spinal cord. It is essential for the proper functioning of the central nervous system. One of the primary functions of CSF is to provide mechanical protection to the brain by cushioning it against impacts or sudden movements. CSF also helps in the exchange of nutrients and metabolic waste products between the brain and the circulatory system. In addition, CSF helps carry neuroactive hormones and substances, but it does not directly improve the conduction of nerve signals between different brain regions.

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