Lljlhkjjkh Essay

610 words - 2 pages

Hormones, Menstrual Cycle and the Artificial Control of Fertility The hormone FSH is secreted by the pituitary gland. FSH makes two things happen. It causes an egg to mature in an ovary and it stimulates the ovaries to release the hormone oestrogen. The hormone oestrogen is secreted by the ovaries. Oestrogen makes two things happen. It stops FSH being produced - so that only one egg matures in a cycle and it stimulates the pituitary gland to release the hormone LH. The hormone LH causes the mature egg to be released from the ovary. Progesterone is another hormone secreted by ovaries: it maintains the lining of the uterus and stays high during pregnancy.Human fertility is controlled by hormones. This means that knowledge of hormones can be used to decide to increase, or reduce, the chances of fertilisation and pregnancy. The oral contraceptive, 'the pill', greatly reduces the chances of mature eggs being produced. The pill contains oestrogen, or oestrogen and progesterone. These hormones inhibit the production of FSH, which in turn stops eggs maturing in the ovaries. Some women have difficulty becoming pregnant because they don't produce enough FSH to allow their eggs to mature. 'Fertility drugs' contain FSH, which stimulates eggs to mature in the ovary. If a couple are having difficulty conceiving a child because the quantity or quality of the man's sperm is poor then in vitro fertilisation - or IVF - can be used. This is where the egg is fertilised outside the woman's body and then implanted back into her uterus. As FSH can also be used to encourage the production of several mature eggs at once, it is used as part of IVF to increase the number of eggs available for fertilisation.Day 1 Oestrogen and progesterone levels are at their lowest level The...

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