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The bloodâtestis barrier is a physical barrier between the blood vessels and the seminiferous tubules of the animal testes.hen the bloodâtestes barrier is breached, and sperm enters the bloodstream, the immune system mounts an autoimmune response against the sperm. The anti-sperm antibodies generated by the immune system can bind to various antigenic sites on the surface of the sperm.
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.