* produced in the pituitary gland * causes eggs to mature in ovaries * stimulates ovaries to produce oestrogen
2
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lh- luteinising hormone
* produced in the pituitary gland * stimulates release of an egg on day 14
3
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oestrogen
* produced in ovaries * causes the lining in uterus to grow * stimiulates relese of lh & inhibits fh
4
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progesterone
* produced in ovaries * maintains lining in uterus during second half of cycle * when progesterone levels falls the lining breakdowns * inhabits release of lh &f sh