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==Key Stage 3==
===Meaning===
The '''menstrual cycle''' is the changes that happen to the [[Female Reproductive System|female reproductive system]] every 28 days(actually the average is 31 days, but textbooks have put it as 28 for simplicity).
===About the Menstrual Cycle===
: The '''menstrual cycle''' in [[Human|humans]] repeats every month.
{| class="wikitable"
|-
|[[File:MenstrualCycleDay1-6.png|center|200px150px]]|[[File:MenstrualCycleDay7.png|center|200px150px]]|[[File:MenstrualCycleDay9.png|center|200px150px]]|[[File:MenstrualCycleDay11.png|center|200px150px]]
|-
| style="height:20px; width:200px150px; text-align:center;" |In the first 6 days of the '''menstrual cycle''' the uterine wall leaves through the [[vagina]]. This is often called a '[[Menstruation|period]]'.| style="height:20px; width:200px150px; text-align:center;" |On day 7 an [[ovum]] begins to mature and the uterine wall starts to build back up again.| style="height:20px; width:200px150px; text-align:center;" |The uterine wall continues to build up.| style="height:20px; width:200px150px; text-align:center;" |The uterine wall continues to build up.
|-
|[[File:MenstrualCycleDay13.png|center|200px150px]]|[[File:MenstrualCycleDay14.png|center|200px150px]]|[[File:MenstrualCycleDay15-17.png|center|200px150px]]|[[File:MenstrualCycleDay18-28.png|center|200px150px]]
|-
| style="height:20px; width:200px150px; text-align:center;" |The uterine wall continues to build up.| style="height:20px; width:200px150px; text-align:center;" |The [[ovum]] is released from the [[ovary]].| style="height:20px; width:200px150px; text-align:center;" |The [[ovum]] travels down the [[oviduct]].| style="height:20px; width:200px150px; text-align:center;" |If the [[ovum]] is not [[fertilise]]d the uterine wall breaks down.
|}
| style="height:20px; width:500px; text-align:center;" |A [[graph]] showing the relative thickness of the [[Uterus|uterine wall]] through the 28 days of the '''menstrual cycle'''.
|}
==Key Stage 4==
===Meaning===
The '''menstrual cycle''' is a regular change in the [[Organ|organs]] of the [[Female Reproductive System|female reproductive system]] that include [[ovulation]] and [[menstruation]] (periods).
===About the Menstrual Cycle===
: The '''menstrual cycle''' is controlled by the [[hormone]]s; [[oestrogen]], [[progesterone]], [[Luteinising Hormone|luteinising hormone]] and [[Follicle Stimulating Hormone|follicle stimulating hormone]].
{| class="wikitable"
|-
|[[File:MenstrualCycleGraph2.png|center|500px]]
|-
| style="height:20px; width:500px; text-align:left;" |A [[graph]] showing changes during the '''menstrual cycle''' in:
: The stages of [[follicle]] growth and [[ovulation]].
: The [[Body Temperature|body temperature]].
: The [[hormone]] levels.
: The relative thickness of the [[Uterus|uterine wall]].
|}
*[[Oestrogen]] and [[Progesterone]] - [[Secrete]]d by the [[ovary|ovaries]] in [[female]]s and causes the lining of the [[uterus]] to become thicker during the [[Menstrual Cycle|menstrual cycle]].
*[[Luteinising Hormone]] - [[Secrete]]d by the [[Pituitary Gland|pituitary gland]] in [[female]]s and causes an [[ovum]] to be released from a [[follicle]] in the [[ovary|ovaries]].
*[[Follicle Stimulating Hormone]] - [[Secrete]]d by the [[Pituitary Gland|pituitary gland]] in [[female]]s and causes [[follicle]]s to grow in the [[ovary|ovaries]] and stimulates the production of [[oestrogen]].
===References===
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1782945741/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945741&linkCode=as2&tag=nrjc-21&linkId=30da4f2178da182547b62a7329d13b57 ''Menstrual cycle, page 54, GCSE Combined Science; The Revision Guide, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782946748/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946748&linkCode=as2&tag=nrjc-21&linkId=a4f0348fc37d0ba1bb52d27f8679581f ''Menstrual cycle, page 79, GCSE Biology; The Revision Guide, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1292120193/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120193&linkCode=as2&tag=nrjc-21&linkId=572df39392fb4200db8391d98ae6314e ''Menstrual cycle, pages 102-103, GCSE Combined Science, Pearson Edexcel '']
:[https://www.amazon.co.uk/gp/product/1292120207/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120207&linkCode=as2&tag=nrjc-21&linkId=22455ff53961978667722edaa64c0be5 ''Menstrual cycle, pages 146-147, GCSE Biology, Pearson, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782948120/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948120&linkCode=as2&tag=nrjc-21&linkId=dedef775c6a43dbb0a609441525adac0 ''Menstrual cycle, pages 229-231, GCSE Biology, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1292120193/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120193&linkCode=as2&tag=nrjc-21&linkId=572df39392fb4200db8391d98ae6314e ''Menstrual cycle; hormonal control, pages 104-105, GCSE Combined Science, Pearson Edexcel '']
:[https://www.amazon.co.uk/gp/product/1292120207/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120207&linkCode=as2&tag=nrjc-21&linkId=22455ff53961978667722edaa64c0be5 ''Menstrual cycle; hormonal control, pages 148-149, GCSE Biology, Pearson, Edexcel '']
====OCR====
:[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Menstrual cycle, page 38, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']
:[https://www.amazon.co.uk/gp/product/1782945660/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945660&linkCode=as2&tag=nrjc-21&linkId=83aa4500ad7759e7f401a1c5ba5df758 ''Menstrual cycle, page 47, Gateway GCSE Biology; The Revision Guide, CGP, OCR '']
:[https://www.amazon.co.uk/gp/product/0198359810/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359810&linkCode=as2&tag=nrjc-21&linkId=d768d99f1a06f7c12fab40e5aef85a55 ''Menstrual cycle, pages 104-105, Gateway GCSE Biology, Oxford, OCR '']
===Extra Information===
{{#ev:youtube|https://www.youtube.com/watch?v=ayzN5f3qN8g}}