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The menstrual cycle

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Tutor: Jasmine


The menstrual cycle

In a nutshell

The menstrual cycle is the process where the female body prepares the uterus in case it receives a fertilised egg. If an egg is not fertilised, the uterus lining will shed and cause bleeding from the vagina. The menstrual cycle lasts for approximately 2828​ days.

Science; Human reproduction; KS3 Year 7; The menstrual cycle

The menstrual cycle occurs in four stages. Stage one occurs on days 141-4​, stage two occurs on days 4144-14​, stage three occurs on day 1414​ and stage four occurs on days 142814-28​.




Bleeding from the vagina begins as the uterus lining is shed, this is called menstruation or having a period.


The blood loss stops and the uterus lining begins to build up again. An egg starts to mature in an ovary.


A mature egg is released from the ovary, it travels through the oviduct into the uterus. This is known as ovulation.


The uterus wall is thick as it waits for a fertilised egg, if the egg is not fertilised it will be shed and the whole cycle starts again.

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