FSH: Stimulates egg to mature in ovary, Secreted by pituitary gland at the start and mid-way points of cycle, Stimulates ovary to produce oestrogen, LH: Secreted by pituitary gland mid-way through cycle, Surge in levels triggers ovulation, Oestrogen: Secreted by ovary , Stimulates the release of LH, Inhibits the further production of FSH, Stimulates the thickening of the womb lining, Progesterone: Secreted by ovary in final stage of cycle, Fall triggers menstruation (period),

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