Final answer:
Ependymal cells filter blood to produce cerebrospinal fluid in the CNS.
Explanation:
Ependymal cells are primarily responsible for filtering the blood to produce cerebrospinal fluid (CSF), which circulates through the central nervous system. These cells line the ventricles and play a crucial role in maintaining CNS function. CSF acts as a protective and nutrient-rich fluid surrounding the brain and spinal cord.
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