Type O negative blood (red cells) can be transfused to patients of all blood types. It is always in great demand and often in short supply. Type AB positive plasma can be transfused to patients of all other blood types. AB plasma is also usually in short supply.
Blood-brain barrier. A blockade of cells separating the circulating blood from elements of the central nervous system (CNS); it acts as a filter, preventing many substances from entering the central nervous system.
The blood-brain barrier (BBB) is a network of tiny blood vessels (capillaries) that separates the interior of the central nervous system (brain and spinal cord) from the rest of the bodyâs circulatory system.he blood-brain barrier (BBB) is a network of tiny blood vessels (capillaries) that separates the interior of the central nervous system (brain and spinal cord) from the rest of the bodyâs circulatory system.