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.
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.
having blood of a specified kind (used in combination): warm-blooded animals. (of horses, cattle, etc.) derived from ancestors of good blood; having a good pedigree. the fluid that circulates in the principal vascular system of human beings and other vertebrates, in humans consisting of plasma in which the red blood cells, white blood cells, and […]
a South American characin fish, Aphyocharax rubropinnis, having a silvery body and bright red fins: popular in home aquariums. noun a silvery red-finned South American freshwater fish, Aphyocharax rubripinnis: a popular aquarium fish: family Characidae (characins)
guilty of murder or bloodshed. Historical Examples A Study of Shakespeare Algernon Charles Swinburne Select Temperance Tracts American Tract Society Sir Walter Ralegh William Stebbing The Origin of Paul’s Religion J. Gresham Machen
stained or covered with blood: a bloody handkerchief. bleeding: a bloody nose. characterized by bloodshed: bloody battle; a bloody rule. inclined to bloodshed; bloodthirsty: a bloody dictator. of, relating to, or resembling blood; containing or composed of blood: bloody tissue. Slang. (used as an intensifier): a bloody shame; a bloody nuisance. to stain or smear […]