A selective semipermeable membrane separating circulating blood from the brain's extracellular fluid, protecting the brain from harmful substances.
Descriptive compound term from 'blood' + 'brain' + 'barrier.' Concept described by Paul Ehrlich in the 1880s.
The blood-brain barrier is your brain's bouncer — it lets in nutrients and oxygen but blocks toxins and most drugs from entering. Very exclusive VIP list!
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