- oestrogen and progesterone are both hormones
- endrocrine gland - hormones through the blood - target tissue (effect)
- ovary is the endrocrine gland for oestrogen
- in the first half of the cycle, the lining of the uturus becomes increasingly thick, this is the effect of oestrogen
- oestrogen flows through the blood to our brain which releases a second hormone called lutenising hormone
- at day 13, this will release an egg
- the folical which once held the egg now produces progestrone
- the progestrone then prevents the lining of the uturus from breaking down
- if the egg is not fertilised then this leds to the break down of the lining which causes menstrual periods
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