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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 bloodâbrain barrier allows the passage of water, some gases, and lipid-soluble molecules by passive diffusion, as well as the selective transport of molecules such as glucose and amino acids that are crucial to neural function.he bloodâbrain barrier is composed of high-density cells restricting passage of substances from the bloodstream much more than do the endothelial cells in capillaries elsewhere in the body.