Fertilisation key terms

causes ovulation

causes the egg to mature in the ovary

is triggered by a decrease in oestrogen

causes oestrogen to increase

is triggered by a increase in oestrogen

causes oestrogen to decrease

stays low from day 1 – 14 and starts to rise once ovulation has occurred

stays high from day 1 – 14 and starts to drop once ovulation has occurred

this causes the uterus lining to shed

this causes the uterus lining to thicken further

when the level drops menstruation occurs

when the rise drops menstruation occurs

levels rise from day 1 to peak just before day 14

levels drop from day 1 to peak just before day 14

stimulates uterine wall to start thickening and the egg to mature

stimulates uterine wall to start reducing and the egg to release