The blood-brain barrier consists of
A) capillaries whose cells are firmly attached by overlapping tight junctions surrounded by astrocytes.
B) a sheet of muscle tissue that separates the brain from the skull.
C) aligned blood cells.
D) capillaries joined by desmosomes that are closer together than they are elsewhere.

Question

Quizplus · Accepted Answer

The blood-brain barrier is made up of capillaries whose endothelial cells are joined tightly with overlapping tight junctions that are surrounded by astrocytes. This barrier helps to prevent the entry of harmful substances into the brain while allowing necessary nutrients to flow through.

The Blood-Brain Barrier Consists of