FSH (Follicle-Stimulating Hormone)
Causes follicle to mature in one of ovaries.
Stimulates oestrogen production.
Causes lining of uterus to thicken and grow.
High level stimulates LH surge.
LH (Luteneising Hormone)
Surge stimulates ovulation (Day 14) - Follicle ruptures and egg released.
Stimulates remains of follicle to develop into corpus luteum (Secretes progesterone)
Maintains lining of uterus.
Inhibits production of FSH and LH.
When level falls, there's low oestrogen, uterus lining breaks down.
Low levels allows FSH to increase.