And what GnRH does is it stimulates the release of the follicle stimulating hormone and the luteinizing hormone from the interior pituitary gland. Now these two hormones then go down to the ovary and affect the immature follicle the follicle stimulating hormone as well as LH causes that follicle to begin to develop into the secondary follicle. So what happens first is the primary follicle or the primary oocide in the primary follicle undergoes meiosis one and produces a secondary follicle. And inside that secondary follicle we have that secondary oicide. So to see what we mean, let's take a look at the following diagram so initially the GnRH causes, let's say, the follicle stimulating hormone to increase in concentration as shown in the following diagram. And as FSH increases, that stimulates the primary follicle to become the secondary follicle.