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Carrier-mediated transport enables molecules with low lipid solubility to traverse the blood-brain barrier. Glucose from blood enters the brain by a transport protein. Glucose is the primary energy substrate of the brain. Glucose transport protein (GLUT-1) is highly enriched in brain capillary endothelial cells. These transporters carry glucose molecules through the blood brain barrier.
1 7 - Once activated, the Helper T cell starts to divide and produce special proteins to signal other immune cells. 2  The activated Helper T cell will in turn activate other T cells to attack the specific antigen 3  (). It also can go on to activate B cells and create an antibody-mediated response. cells are like the police chiefs of white blood cells. T cells are white blood cells called lymphocytes. There are many different types of T cells that all perform different functions, but among the most important are Helper T cells and Killer T cells.