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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).
Why Is Blood Important. Blood is a body fluid that delivers essential substances like nutrients and oxygen to the cells of the body. Blood also transports carbon dioxide and other waste products away from the cells, to the lungs, kidneys, and digestive system; from there they are removed from the body. Blood performs important functions, some of which are as under:-. 2  Supply of oxygen to cells / tissues. 3  Supply of nutrients such as glucose, amino acids and fatty acids Removal of waste such as carbon dioxide, urea and lactic acid.