Blood-brain barrier 

Blood-brain barrier is a barrier between the blood and the brain tissue through which blood gases and nutrients flow. This barrier provides chemical isolation of the nervous system from the rest of the body, thus creating a controlled entry and exit of chemicals in the brain.

Conditions threatening the blood-brain barrier

There is a presumption that the blood-brain barrier undergoes structural changes due to some diseases. If the barrier weakens, neurodegenerative disorders may occur.

These diseases are:

• hypertension (high blood pressure)
• infections in some parts of the central nervous system (e.g. meningitis)
• stroke
• multiple sclerosis