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a layer of tightly packed cells that make up the walls of brain capillaries and prevent substances in the blood from diffusing freely into the brain: passage across the cell membranes is determined by solubility in the lipid bilayer or recognition by a transport molecule.
Contemporary Examples

Scientists Find Bacteria Where It Isn’t Supposed to Be: The Brain Amanda Schaffer March 16, 2013

blood-brain barrier
A physiological mechanism that alters the permeability of capillaries in the brain, so that some substances, such as certain drugs, are prevented from entering brain tissue, while other substances are allowed to enter freely.

Note: Oxygen, glucose, and white blood cells are molecules that are able to pass through this barrier. Red blood cells cannot.


Read Also:

  • Blood-brother

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  • Blood-capillary

    blood capillary Historical Examples Physiology Ernest G. Martin

  • Blood-cell

    any of the cellular elements of the blood, as white blood cells or red blood cells. noun any of the cells that circulate in the blood See erythrocyte, leucocyte blood cell A red blood cell or white blood cell that is contained in the blood.

  • Blood-chit

    blood chit

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