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. Osteoporosis is essentially the breakdown of our bone, our bone matrix, as a result of old age. And it also stimulates the closure of our epiphysical plate found in our long bone. So it's not only involved in actually elongating our bone, but it is also involved in ending the process of elongation in our long bones.