The menstrual cycle is a monthly process that prepares your... Show more
Biology268 views·Updated May 28, 2026·2 pagesUnderstanding the Menstrual Cycle and Hormonal Interactions
Nadiya Islam@nadiyaaa
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Understanding the Monthly Cycle
Your menstrual cycle runs on roughly a 28-day schedule, though this varies between individuals. Every month, your ovaries release an egg during ovulation, whilst your uterus prepares by thickening its lining to potentially support a fertilised egg.
If the egg isn't fertilised by sperm, both the egg and the thick uterine lining are shed during your period. This entire process is controlled by four crucial hormones working in sequence.
Follicle Stimulating Hormone (FSH) kicks off the cycle by making eggs mature in your ovaries. Luteinising Hormone (LH) then triggers the release of that mature egg. Meanwhile, oestrogen and progesterone work together to maintain the uterus lining, keeping it ready for a potential pregnancy.
Key Point: Think of these hormones as a relay team - each one passes the baton to trigger the next stage of your cycle.
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How Hormones Control the Process
The hormone interaction follows a precise pattern that's brilliant in its complexity. FSH from your pituitary gland travels to your ovaries, causing egg maturation and triggering oestrogen production.
Rising oestrogen levels create a feedback loop - they stop FSH production whilst simultaneously triggering LH release. This LH surge around day 14 causes ovulation, after which your ovary switches to producing progesterone.
Progesterone keeps the uterus lining thick and blocks further FSH and LH release, preventing additional eggs from developing. However, if fertilisation doesn't occur, progesterone levels plummet, causing the uterine lining to shed as your period begins.
Exam Tip: When reading hormone graphs, look for FSH rising first, then oestrogen, followed by the LH peak at ovulation, and finally progesterone's rise and fall.
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Biology268 views·Updated May 28, 2026·2 pagesUnderstanding the Menstrual Cycle and Hormonal Interactions
Nadiya Islam@nadiyaaa
The menstrual cycle is a monthly process that prepares your body for potential pregnancy. Four key hormones work together like a perfectly timed dance to control ovulation, prepare the uterus, and trigger periods when pregnancy doesn't occur.
1
of 2Sign up to see the content. It's free!
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- Join milions of students
Understanding the Monthly Cycle
Your menstrual cycle runs on roughly a 28-day schedule, though this varies between individuals. Every month, your ovaries release an egg during ovulation, whilst your uterus prepares by thickening its lining to potentially support a fertilised egg.
If the egg isn't fertilised by sperm, both the egg and the thick uterine lining are shed during your period. This entire process is controlled by four crucial hormones working in sequence.
Follicle Stimulating Hormone (FSH) kicks off the cycle by making eggs mature in your ovaries. Luteinising Hormone (LH) then triggers the release of that mature egg. Meanwhile, oestrogen and progesterone work together to maintain the uterus lining, keeping it ready for a potential pregnancy.
Key Point: Think of these hormones as a relay team - each one passes the baton to trigger the next stage of your cycle.
2
of 2Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
How Hormones Control the Process
The hormone interaction follows a precise pattern that's brilliant in its complexity. FSH from your pituitary gland travels to your ovaries, causing egg maturation and triggering oestrogen production.
Rising oestrogen levels create a feedback loop - they stop FSH production whilst simultaneously triggering LH release. This LH surge around day 14 causes ovulation, after which your ovary switches to producing progesterone.
Progesterone keeps the uterus lining thick and blocks further FSH and LH release, preventing additional eggs from developing. However, if fertilisation doesn't occur, progesterone levels plummet, causing the uterine lining to shed as your period begins.
Exam Tip: When reading hormone graphs, look for FSH rising first, then oestrogen, followed by the LH peak at ovulation, and finally progesterone's rise and fall.
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Similar content
Most popular content: Female Reproductive System
4Most popular content in Biology
9Most popular content
9Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5App Store
4.7/5Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan SiOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha KlichAndroid user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
AnnaiOS user