A series of cyclic changes found in the reproductive tract of human female during her reproductive life that recur at intervals of about 28 days and is characterised by menstruation in the first 3-4 days. Hormone :
- GnRH (Gonado tropin Releasing Hormone)
- FSH (Follicle Stimulating Hormone)
- LH (Luteinizing Hormone)
- Estrogen
- Progesterone