Question

question 9
the glia cells that help form the blood - brain barrier are the
○ astrocytes.
○ microglia.
○ oligodendrocytes.
○ ependymal cells.

Explanation:

Astrocytes are glial cells that have end - feet which interact with the endothelial cells of blood vessels in the brain to help form the blood - brain barrier. Microglia are immune - like cells in the brain. Oligodendrocytes form myelin sheaths around axons in the central nervous system. Ependymal cells line the ventricles of the brain and are involved in cerebrospinal fluid production and circulation.

Answer:

A. astrocytes