And once it attaches to the endocrine cells in the interior pituitary gland, it causes those endocrine cells to release the follicle stimulating hormone and the lutenizing hormone. Now, the lee nizing hormone travels through our bloodstream and eventually attaches onto our lathic cells and it stimulates those Levic cells to release testosterone. At the same time the follicle stimulating hormone attaches onto our surtovi cells and it causes these cells to basically provide the nutrients to our developing sperm cells. While testosterone actually initiates the development of our sperm cells into mature sperm cells at the same time testosterone also causes these other different these other different effects. So for example, it's responsible for actually creating that growth sperm. It's responsible for giving us our secondary characteristics such as our enlarged langs, a deep voice, our pubic hair and other things of that nature.