Question

specialized ______ form the secretory component of the choroid plexus. ependymal cells microglia arachnoid cells satellite cells astrocytes

Explanation:

Ependymal cells are a type of neuroglia (glial cell) in the central nervous system. They line the ventricles of the brain and the central canal of the spinal cord. Specialized ependymal cells in the choroid plexus are responsible for secreting cerebro - spinal fluid (CSF). Microglia are phagocytic cells in the CNS, arachnoid cells are part of the meninges (not directly related to the secretory component of the choroid plexus), satellite cells are in the peripheral nervous system (associated with neuron cell bodies in ganglia), and astrocytes have functions like providing support and maintaining the blood - brain barrier but are not the secretory component of the choroid plexus.

Answer:

ependymal cells