And this is what is described by the cycle. So GnRH released by the Hypothalamus stimulates FSH and LH to also release and that causes estrogen to increase in concentration as a result. Now eventually what happens is Ovulation. So notice as we have an increase in our estrogen, the increase in estrogen basically creates a positive feedback loop. It positively affects the amount of LH produced. So it causes more GnRH to release and that causes more LH to actually release and eventually causes something called the luteinizing surge or the luteinizing hormone surge or the LH surge.