blood-brain barrier

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English[edit]

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Noun[edit]

blood-brain barrier (plural blood-brain barriers)

  1. (anatomy) A structure in the central nervous system (CNS) that keeps various substances found in the bloodstream out of the brain while allowing in the substances essential to metabolic function, e.g. oxygen.
    • 2010, Siddhartha Mukherjee, The Emperor of All Maladies, Fourth Estate (2011), page 147:
      The brain and spinal cord are insulated by a tight cellular seal called the blood-brain barrier that prevents foreign chemicals from easily getting into the brain.

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