The Menstrual Cycle

What is The Menstrual Cycle?

Within Biology, which covers cells, the human body, genetics, evolution, plants and ecosystems: the science of living things, this topic explains The Menstrual Cycle. Biology topics show how living things work, from the cell up to whole ecosystems, with models you can explore step by step.

Check that you can explain The Menstrual Cycle in your own words and give one example from everyday life. If you can do that, you have understood the core idea.

Understanding The Menstrual Cycle helps you explain how living things stay alive and respond to their surroundings, which is central to biology exams.

The Menstrual Cycle in detail

The menstrual cycle lasts about 28 days and prepares the body for pregnancy, controlled by hormones. During the first days, the uterus lining breaks down (menstruation). It then rebuilds, and around day 14 an egg is released from an ovary in ovulation.

Hormones involved are FSH (stimulates egg development and oestrogen), oestrogen (repairs the lining and triggers LH), LH (triggers ovulation) and progesterone (maintains the lining). If the egg is not fertilised, progesterone falls and the lining breaks down. Fertility treatments and contraceptive pills use hormones to influence the cycle.

How the interactive helps you understand The Menstrual Cycle

Watch the cycle in the interactive. Use any sliders or buttons it offers to change the values and see how the cycle responds.

Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of The Menstrual Cycle.

Real-life uses and examples

• Use The Menstrual Cycle to interpret a diagram, graph or microscope image from a practical.
• Structure a longer answer about The Menstrual Cycle by moving from definition to example to consequence.
• Explain how The Menstrual Cycle helps a living thing stay alive, using a plant or animal example.

Common mistakes to avoid

• Using everyday words, such as “energy” or “bad”, without their scientific meaning.
• Listing the steps of a process without saying how one step causes the next.
• Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.