Blood-brain barrier

Definition: A highly-selective semipermeable membrane, or gatekeeper, that separates the circulating blood from the brain and extracellular fluid in the central nervous system. Allows in vital nutrients to maintain constant levels of hormones, nutrients and water, and guards against toxins and pathogens. Creams, balms and other surface topicals with CBD / THC compositions can be effective without intoxicating because they affect CB2 receptors in peripheral tissues work, not CB1 involving the BBB.

Also known as: BBB

Category: Biologiy & Medical

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