Final answer:
Ependymal cells are the type of glial cells that are part of the blood brain barrier and line ventricles. They filter the blood to produce cerebrospinal fluid and play a role in the formation of the blood-brain barrier.
Step-by-step explanation:
The glial cell that is part of the blood brain barrier and lines ventricles is ependymal cells. Ependymal cells are responsible for filtering the blood to produce cerebrospinal fluid (CSF) and they line each ventricle, which is one of the four central cavities in the brain. They also play a role in the formation of the blood-brain barrier.