I am a little bit confused about FSH, LH and Oestrogen. The Biology B AQA syllabus has the following information about them:-
FSH causes the ripening of the egg and is released by the pituitary gland. It also stimulates oestrogen production.
LH is also produced by the pituitary gland and it causes the egg to be released at about the middle of the menstrual cycle.
Oestrogen is produced in the ovaries and stimulates the pituitary gland to produce more LH. It also inhibits the further production of FSH.
The bits in bold are the bits that I am stuck on. I don't quite understand how it works. if FSH stimulates oestrogen production and oestrogen inhibits further FSH production, in a way they contradict each other. FSH causes oestrogen to be released but oestrogen stops FSH from being released.