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| Name | Hormonal Interactions in the Menstrual Cycle | 9-1 GCSE Science Biology | OCR, AQA, Edexcel |
| Video Uploader | Video From SnapRevise |
| Upload Date | This Video Uploaded At 31-08-2018 22:46:05 |
| Video Discription | https://goo.gl/zKiAXi to unlock the full GCSE Biology & Combined Science videos series for the new 9-1 OCR, AQA and Edexcel specifications. They key points covered in this video include: 1. Hormonal Interactions in the Menstrual Cycle 2. Interpreting the graphs showing the menstrual cycle Hormonal Interactions in the Menstrual Cycle LH, FSH, oestrogen and progesterone are all hormones involved in the menstrual cycle. The levels of these four hormones are always changing. They interact with each other i.e. they promote or inhibit the release of other hormones. FSH stimulates the ovaries to produce oestrogen. Oestrogen inhibits the production of FSH - this prevents more than one egg maturing. Oestrogen also stimulates the pituitary gland to release luteinising hormone (LH). Progesterone inhibits LH. Interpreting the Graphs showing the Menstrual Cycle Let's now consider all of this together with a graph: This can be broken down into steps: 1. The pituitary gland releases more FSH at the start of the cycle. 2. This causes a follicle to mature in an ovary and stimulates the production of oestrogen. 3. Oestrogen causes the lining of the uterus to grow and stimulates the a surge of LH (a rapid increase in LH) from the pituitary gland. 4. LH causes the follicle to rupture and release the egg. 5. LH also stimulates the remains of the follicle to develop into a structure called the corpus luteum. 6. Progesterone is produced by the corpus luteum after ovulation - it maintains the lining of the uterus. 7. When progesterone levels fall, the lining breaks down. 8. Progesterone inhibits the release of LH and FSH - so when the levels of progesterone fall, the cycle starts again. 9. If the egg is fertilised (i.e. if the woman becomes pregnant), the level of progesterone will stay high so the lining of the uterus is maintained during pregnancy. Summary 1. The hormones involved the menstrual cycle interact with each other 2. FSH stimulates the ovaries to produce oestrogen 3. Oestrogen acts on the pituitary gland to inhibit the production of FSH and increase the production of LH 4. Progesterone inhibits LH 5. The changing levels of reproductive hormones can be displayed in a graph tpkPSUc0Ogc |
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| Tags | snaprevise | gcse | biology | gcse biology | combined science | ocr | aqa | edexcel | 9-1 gcse | hormone | interaction | menstrual cycle | LH | FSH | estrogen | progesterone | egg | pituitary gland | pregnancy | corpus luteum | follicle | ovulation | uterus | fertilisation | reproductive |
