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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 answer is because of the blood-brain barrier. This layer of cells keeps your brain safe from pathogens and other toxins. It is composed of brain cells and blood vessel cells. It plays a crucial role in protecting the most important organ in your body: the brain. The blood-brain barrier is like the moat outside a castle, preventing harmful invaders from entering.