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GCSE Biology · key term
A selective boundary formed by the brain's blood vessels that restricts the movement of many substances from the blood into brain tissue.
Used by Edexcel and OCR
Specification 2.12B · Paper 1
A selectively permeable boundary formed by the brain's capillaries that restricts the movement of many substances from the blood into brain tissue.
Revise: Treating CNS DamageTogether they form the blood–brain barrier, which restricts the substances that can leave the blood and enter brain tissue.
Specification B3.1h · Paper 1 (Foundation), Paper 3 (Higher)
Revise: Treating brain damageThe blood–brain barrier creates a different kind of access problem. Capillaries supplying the brain form a selective boundary that prevents many substances from moving freely from the blood into brain tissue. This helps protect the brain from harmful substances, but it can also prevent some medicines from reaching their intended site in an effective concentration.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A selective barrier formed by blood vessels in the brain that restricts the movement of many substances from the blood into brain tissue.
Revise: Treating Nervous System DamageThe brain has another protective feature. Its capillaries restrict the movement of many substances from the blood into brain tissue. This blood–brain barrier helps protect the brain, but it also means that some medicines in the bloodstream cannot reach it easily.
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