Now, when the luteinizing hormone is released into our bloodstream, it travels down to the capillaries of our simoniferous tubules and it attaches to the cell membrane of these latic cells and then basically stimulates these latic cells to release a special type of androgen known as testosterone. Now, testosterone is a steroid hormone and that means it is lipid soluble and it can easily pass across the cell membrane of target cells. So the receptor proteins of testosterone are found inside our cell. Now, testosterone has many important functions. Firstly, it basically stimulates and initiates the production of our sperm cells inside these regions between our surtoli cells. And we'll discuss what the function of sirtoli cells are in just a moment.