Describe how hormones from the ovary and pituitary gland interact to control the human menstruation cycle.

Describe how hormones from the ovary and pituitary gland interact to control the human menstruation cycle.

1. Just after menstruation, the anterior lobe of the pituitary gland starts secreting FSH.
2. FSH cause a Graafian follicle to develop in the ovary to secrete oestrogen.
3. Oestrogen

• brings about the healing and repair of the uterine endometrium following menstruation.
• inhibits production of FSH
• stimulates production of LH.

In the course of 11 days or so the amount of oestrogen in blood stream steadily increases. Then shortly before evolution takes place, LH is released.

4. LH

• causes ovulation
• promotes development the Graafian follicle into a corpus luteum to secrete progesterone

5. The corpus luteum secretes progesterone.
6. Progesterone

• This along with oestrogen, causes the continued thickening and vascularization of the uterine endometrium in preparation for implantation.
• Inhibits secretion of LH leading to degeneration of corpus luteum

7. For a week or so after ovulation the concentration of progesterone and oestrogen gradually increase and then suddenly decrease.
8. With the fall in the levels of the two hormones, the uterine endometrium begins to disintegrate and menstruation starts and the cycle repeats.

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