And these mitochondria are needed to produce ATP because the ATP is needed by the tail. The tail consists of a flagellum that is needed for locomotion. The flagellum basically allows the cell to actually move from point A to point B along these tubules, along these canals. So once again we see that inside the male gonas our testes, we have these tubules known as seminiplus tubules. And inside the wall of the semiiflose tubules we have the sperm cells being produced in a process known as spermatogenesis. So we have Ladic cells that produce testosterone that stimulates the differentiation of spermatogonium into primary spermatocides.