Day 1 menstruation starts, lasts around 4 days and FSH levels rise,causing eggs in ovaries to mature.
As FSH levels rise this stimulates the production of Oestrogen in ovaries.As Oestrogen levels rise, this inhibits the production of FSH(so only 1 egg is released in each cycle),so FSH levels fall. Oestrogen causes uterus lining to thicken + grow.Secretion of Oestrogen also stimulates production of LH from the Pituitary gland(master gland).
LH levels continue to rise and peak around day 14 when Ovulation occurs.After ovulation, Progesterone is secreted from the Ovaries,and their levels rise-inhibiting the production of LH & FSH.
Progestrone cause the uterus lining to be maintained,for a fertilised egg to be implanted into the uterus wall till around day 28.After that, progesterone levels fall as no fertilised egg has been implanted into the uterus wall-allows FSH to increase.And the cycle starts all over again.
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