The blood-brain barrier protects the brain
A) mostly during fetal development.
B) from fat-soluble substances.
C) by maintaining a brain blood supply that is separate from the circulation to the rest of the body.
D) through the action of astrocytes that reduce the permeability of small blood vessels.
E) and spinal cord and peripheral nervous system.

Question

Quizplus · Accepted Answer

The blood-brain barrier (BBB) is primarily maintained through the action of astrocytes. These cells contribute to the structure and function of the BBB by reducing the permeability of capillaries in the brain, thereby limiting the substances that can pass from the bloodstream into the brain tissue. This mechanism is crucial for protecting the brain from potentially harmful substances and pathogens circulating in the blood.

The Blood-Brain Barrier Protects the Brain