Gonadotropins are hormones secreted by the pituitary gland after the stimulation of GnRH pulses. Gonadotropins are produced by men and women and they regulate the reproductive cycle in both cases, although they do not have the same levels of gonadotropins and the actions regulated are different in each case. There are three types of gonadotropic hormones: FSH, LH, and hCG.
GnRH antagonists are a type of chemical compound used as a medicine in assisted reproduction in order to stimulate women during the ovarian cycle.
These hormones are responsible for both the male and female gonadal development as well as the regulation of the sexual cycle, sperm production, and the menstrual cycle.
Regulated by hormones, the ovarian cycle consists fundamentally of three phases: the follicular phase, the ovulatory phase, and finally the luteal phase. At each phase, different sets of hormones take part.