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The function of the immunological barrier in the epididymis is to protect the sperm from attack by the immune system. Primarily, this function is carried out by the BEB, which sequesters sperm antigens and restricts entry of immunoglobulins and immune cells (Fig. 2 B).
The barrier function of the bloodâbrain barrier is due to: (1) tight junctions that restrict movement of substances between the endothelial cells, (2) specific transport proteins that determine which substances can cross the barrier transcellularly and (3) enzymes that may degrade or alter substances prior to passage.he bloodâbrain barrier consists of endothelial cells lining brain capillaries. It serves to restrict and control the movement of substances between the general circulation and brain extracellular fluid.