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Understanding the 4 Phases of the Menstrual Cycle: Hormones and Charts for GCSE Biology

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Understanding the 4 Phases of the Menstrual Cycle: Hormones and Charts for GCSE Biology
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Massi_mtb

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The menstrual cycle is a complex biological process controlled by four key hormones, lasting approximately 28 days. It involves changes in the uterus and ovaries, preparing the body for potential pregnancy. The 4 phases of menstrual cycle include menstruation, the follicular phase, ovulation, and the luteal phase, each characterized by specific hormonal changes and physical events.

  • The cycle begins with menstruation, lasting 4-7 days
  • Hormones FSH, LH, estrogen, and progesterone play crucial roles
  • Ovulation occurs around day 14, releasing an egg
  • If fertilization doesn't occur, the cycle restarts

03/04/2023

738

Menstrual Cycle
Fallopian tube
Uteras
Ovarg
-cervix
Vagina
Staget: Menstration / period. The
Breakdown of the uterus lining.
lasts & 4 to 7

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The Menstrual Cycle: A Comprehensive Overview

The menstrual cycle is a crucial biological process in female reproductive health, typically lasting about 28 days. This cycle is intricately controlled by four primary hormones and consists of several distinct stages, each playing a vital role in preparing the body for potential pregnancy.

Menstrual Cycle Phases and Anatomy

The menstrual cycle involves several key reproductive organs:

  1. Fallopian tubes
  2. Uterus
  3. Ovaries
  4. Cervix
  5. Vagina

Vocabulary: The uterus is the organ where a fertilized egg implants and develops into a fetus during pregnancy.

The 4 Phases of Menstrual Cycle

  1. Menstruation (Stage 1): This phase marks the beginning of the cycle, lasting approximately 4 to 7 days. During this time, the uterine lining breaks down and is shed through the vagina.

Highlight: Menstruation can often be accompanied by cramps, which are contractions of the uterus as it expels its lining.

  1. Follicular Phase (Stage 2): Following menstruation, the uterine lining begins to rebuild. This phase typically lasts from day 4 to day 14 of the cycle.

  2. Ovulation (Stage 3): Around day 14, an egg is released from one of the ovaries. This process is known as ovulation.

  3. Luteal Phase (Stage 4): The final phase involves maintaining the uterine lining for about 14 days, until around day 28. If a fertilized egg doesn't implant, the lining begins to break down, and the cycle restarts.

Example: If ovulation occurs on day 14 and fertilization doesn't happen, menstruation would typically begin around day 28, marking the start of a new cycle.

Hormonal Control of the Menstrual Cycle

The menstrual cycle is regulated by four primary hormones, each playing a specific role:

  1. Follicle-Stimulating Hormone (FSH):
    • Produced in the pituitary gland
    • Causes an egg to mature
    • Stimulates the ovaries to produce estrogen
    • Peaks around day 14

Definition: FSH is a gonadotropin that stimulates the growth of ovarian follicles, preparing them for egg release.

  1. Estrogen:
    • Produced in the ovaries
    • Stimulates the uterine lining to grow
    • Increases during stage 2 (follicular phase)
    • Decreases during stages 3-4
    • Inhibits the release of FSH
    • Stimulates the release of LH

Highlight: The role of estrogen in menstrual cycle GCSE studies is crucial, as it plays a part in multiple phases and influences other hormones.

  1. Luteinizing Hormone (LH):
    • Produced by the pituitary gland
    • Stimulates the release of the egg
    • Peaks on day 14 (ovulation)

Vocabulary: The LH surge triggers ovulation, releasing the mature egg from the ovary.

  1. Progesterone:
    • Produced in the ovaries
    • Maintains the lining of the uterus
    • Increases during stage 4 (luteal phase)
    • Progesterone levels drop if fertilization doesn't occur, leading to the start of a new cycle

Example: To explain how hormones control the menstrual cycle 6 marks in a GCSE exam, you would need to describe the roles of all four hormones and how they interact throughout the cycle phases.

Understanding the menstrual cycle hormones and functions is essential for GCSE Biology, whether studying with AQA, Edexcel, or other exam boards. This knowledge forms the foundation for comprehending female reproductive health and the intricate balance of hormones that regulate it.

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Understanding the 4 Phases of the Menstrual Cycle: Hormones and Charts for GCSE Biology

user profile picture

Massi_mtb

@massi_mtb

·

1 Follower

Follow

The menstrual cycle is a complex biological process controlled by four key hormones, lasting approximately 28 days. It involves changes in the uterus and ovaries, preparing the body for potential pregnancy. The 4 phases of menstrual cycle include menstruation, the follicular phase, ovulation, and the luteal phase, each characterized by specific hormonal changes and physical events.

  • The cycle begins with menstruation, lasting 4-7 days
  • Hormones FSH, LH, estrogen, and progesterone play crucial roles
  • Ovulation occurs around day 14, releasing an egg
  • If fertilization doesn't occur, the cycle restarts

03/04/2023

738

 

10/11

 

Biology

18

Menstrual Cycle
Fallopian tube
Uteras
Ovarg
-cervix
Vagina
Staget: Menstration / period. The
Breakdown of the uterus lining.
lasts & 4 to 7

The Menstrual Cycle: A Comprehensive Overview

The menstrual cycle is a crucial biological process in female reproductive health, typically lasting about 28 days. This cycle is intricately controlled by four primary hormones and consists of several distinct stages, each playing a vital role in preparing the body for potential pregnancy.

Menstrual Cycle Phases and Anatomy

The menstrual cycle involves several key reproductive organs:

  1. Fallopian tubes
  2. Uterus
  3. Ovaries
  4. Cervix
  5. Vagina

Vocabulary: The uterus is the organ where a fertilized egg implants and develops into a fetus during pregnancy.

The 4 Phases of Menstrual Cycle

  1. Menstruation (Stage 1): This phase marks the beginning of the cycle, lasting approximately 4 to 7 days. During this time, the uterine lining breaks down and is shed through the vagina.

Highlight: Menstruation can often be accompanied by cramps, which are contractions of the uterus as it expels its lining.

  1. Follicular Phase (Stage 2): Following menstruation, the uterine lining begins to rebuild. This phase typically lasts from day 4 to day 14 of the cycle.

  2. Ovulation (Stage 3): Around day 14, an egg is released from one of the ovaries. This process is known as ovulation.

  3. Luteal Phase (Stage 4): The final phase involves maintaining the uterine lining for about 14 days, until around day 28. If a fertilized egg doesn't implant, the lining begins to break down, and the cycle restarts.

Example: If ovulation occurs on day 14 and fertilization doesn't happen, menstruation would typically begin around day 28, marking the start of a new cycle.

Hormonal Control of the Menstrual Cycle

The menstrual cycle is regulated by four primary hormones, each playing a specific role:

  1. Follicle-Stimulating Hormone (FSH):
    • Produced in the pituitary gland
    • Causes an egg to mature
    • Stimulates the ovaries to produce estrogen
    • Peaks around day 14

Definition: FSH is a gonadotropin that stimulates the growth of ovarian follicles, preparing them for egg release.

  1. Estrogen:
    • Produced in the ovaries
    • Stimulates the uterine lining to grow
    • Increases during stage 2 (follicular phase)
    • Decreases during stages 3-4
    • Inhibits the release of FSH
    • Stimulates the release of LH

Highlight: The role of estrogen in menstrual cycle GCSE studies is crucial, as it plays a part in multiple phases and influences other hormones.

  1. Luteinizing Hormone (LH):
    • Produced by the pituitary gland
    • Stimulates the release of the egg
    • Peaks on day 14 (ovulation)

Vocabulary: The LH surge triggers ovulation, releasing the mature egg from the ovary.

  1. Progesterone:
    • Produced in the ovaries
    • Maintains the lining of the uterus
    • Increases during stage 4 (luteal phase)
    • Progesterone levels drop if fertilization doesn't occur, leading to the start of a new cycle

Example: To explain how hormones control the menstrual cycle 6 marks in a GCSE exam, you would need to describe the roles of all four hormones and how they interact throughout the cycle phases.

Understanding the menstrual cycle hormones and functions is essential for GCSE Biology, whether studying with AQA, Edexcel, or other exam boards. This knowledge forms the foundation for comprehending female reproductive health and the intricate balance of hormones that regulate it.

Can't find what you're looking for? Explore other subjects.

Knowunity is the #1 education app in five European countries

Knowunity has been named a featured story on Apple and has regularly topped the app store charts in the education category in Germany, Italy, Poland, Switzerland, and the United Kingdom. Join Knowunity today and help millions of students around the world.

Ranked #1 Education App

Download in

Google Play

Download in

App Store

Knowunity is the #1 education app in five European countries

4.9+

Average app rating

13 M

Pupils love Knowunity

#1

In education app charts in 12 countries

950 K+

Students have uploaded notes

Still not convinced? See what other students are saying...

iOS User

I love this app so much, I also use it daily. I recommend Knowunity to everyone!!! I went from a D to an A with it :D

Philip, iOS User

The app is very simple and well designed. So far I have always found everything I was looking for :D

Lena, iOS user

I love this app ❤️ I actually use it every time I study.