Question

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

Explanation:

• Arachnoid cells: Part of the arachnoid mater (meninges layer), not related to choroid plexus secretion.
• Microglia: Act as immune cells in the central nervous system (CNS), phagocytosing debris.
• Ependymal cells: Line the ventricles of the brain and central canal of the spinal cord. Specialized ependymal cells in the choroid plexus secrete cerebro - spinal fluid (CSF).
• Satellite cells: Surround neuron cell bodies in ganglia, providing support.
• Astrocytes: Have multiple functions like regulating the blood - brain barrier, but not the secretory component of the choroid plexus.

Answer:

ependymal cells