Menstrual Hormones

Biology 3 revision

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FSH (Follicle-Stimulating Hormone)

Causes follicle to mature in one of ovaries.

Stimulates oestrogen production.

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Oestrogen

Causes lining of uterus to thicken and grow.

High level stimulates LH surge.

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LH (Luteneising Hormone)

Surge stimulates ovulation (Day 14) - Follicle ruptures and egg released.

Stimulates remains of follicle to develop into corpus luteum (Secretes progesterone)

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Progesterone

Maintains lining of uterus.

Inhibits production of FSH and LH.

When level falls, there's low oestrogen, uterus lining breaks down.

Low levels allows FSH to increase.

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