Blood-brain barrier is network of blood vessels and tissue made up of closely spaced cells. It is made up of astrocyte perivascular feet and capillary endothelial cells.
Blood-brain barrier helps to keep harmful substances away from brain. These barriers allows passing of water, oxygen, general anesthetics, etc. to brain.
The purpose of the blood–brain barrier is protection from circulating toxins or pathogens that can cause brain infections, and allowing vital nutrients to reach the brain.
It is composed of endothelial cells, pericytes and astrocyte perivascular feet and capillary endothelial cells.
Thus the correct option is B.
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