Now, it also causes, it initiates secondary sex characteristics including the growth of pubic hair as well as underarmpit hair. And it also enlarges our larynx and that is what gives us a deeper voice when we're undergoing puberty. Now, it also is responsible for initiating the process of puberty. So basically our growth spurt, this involves the growth of not only our muscle, but also of bone. So it increases the bone and muscle mass in our body during the process of puberty. Now, it is also involved in actually preventing a condition known as osteoporosis.