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The Menstrual Cycle

AQA GCSE Biology B1.2.1

Peter Fearon

on 13 June 2012

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Transcript of The Menstrual Cycle

The Menstrual Cycle Hormones is controlled by control the functions of many of your
body's organs and individual cells chemical substances Made at special glands that secrete
(release) them into the body Target Organ carried in the bloodstream can act quickly often slow but with
long lasting effects What is the menstrual cycle? The average length of the menstrual cycle is 28 days Hormones made in a womans brain
and ovaries control the cycle The levels of different hormones rise and
fall in a regular pattern (or cycle) How do hormones influence
the menstrual cycle? There are three main hormones that we need to consider: FSH Oestrogen LH Folicle Stimulating Hormone Luteinizing Hormone Pituitary Gland Ovaries This makes the egg mature in the ovaries This also stimulates the ovaries to produce oestrogen This stimulates the release of a mature egg from the ovaries in the middle of the menstrual cycle Oestrogen stimulates the lining of the womb to build up ready for pregnancy. In order for successful implantation of the embryo, the lining of the womb needs to swell with blood and nutrients Oestrogen also stimulates the pituitary gland to produce LH Hormones & The Menstrual Cycle The menstrual cycle is controlled by a combination of FSH, LH and Oestrogen Oestrogen levels rise FSH production is inhibited LH production increases Egg is released Key Points Hormones control the release of an egg from the ovary and the build up of the lining of the womb in the menstrual cycle The main hormones involved are FSH and LH from the pituitary gland and oestrogen from the ovary Key Words Menstrual Cycle Ovulation Period Pituitary Gland FSH LH Ovaries Oestrogen Hormones
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