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What is the purpose of the blood-brain barrier? Describe its maintenance from a cellular level. Your Answer: The purpose of the blood-brain barrier is to be a diffusion barrier. This helps prevent particles from entering the central nervous system and keeps the brain and spinal cord separated from general blood circulation. The blood-brain barrier is formed by impermeable capillaries because of glial cells. The maintenance of the blood-brain barrier provides a stable chemical environment for the nervous system. The blood-brain barrier is a diffusion barrier that prevents most particles from entering the central nervous system tissue, keeping the brain and spinal cord separate from general blood circulation. The blood-brain barrier is formed by the relatively impermeable brain capillaries, due to the glial cells astrocytes. Maintenance of the blood-brain-barrier is important to provide a stable chemical environment for the nervous system

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