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Related Concept Videos

Menopause01:28

Menopause

Menopause, a natural biological process marking the end of a woman's fertility, typically occurs between the fifth and sixth decade of life. This phase is characterized by the exhaustion of the ovarian follicle pool, leading to less responsive ovaries despite the high levels of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). The consequential decrease in estrogen production results in symptoms like hot flashes, heavy sweating, headaches, hair loss, muscle pains, vaginal...
Hormonal Regulation of the Menstrual Cycle01:22

Hormonal Regulation of the Menstrual Cycle

The ovarian cycle regulates endometrial changes throughout a single menstrual cycle via the coordinated action of gonadotrophin-releasing hormone (GnRH) and gonadotrophins.
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH release.
Socioemotional Experience and Gender Development01:30

Socioemotional Experience and Gender Development

Social-emotional experiences and cultural influences play significant roles in shaping gender development. During middle childhood, from ages 6 to 11, peer groups become dominant in reinforcing gender norms. Children in this age group often align with same-gender peer groups, which actively encourage behaviors that conform to traditional gender roles. For instance, boys may be discouraged from engaging in activities perceived as feminine, reinforcing culturally dictated norms about masculinity...
Oogenesis02:07

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
Oogenesis01:22

Oogenesis

Oogenesis,  the process of developing egg cells (female gametes), occurs within the ovaries and is fundamental to female fertility. This sequence begins during fetal development when diploid oogonia in the developing ovaries undergo mitotic divisions to produce primary oocytes. By birth, these primary oocytes enter prophase I of meiosis but become arrested in this stage, remaining suspended until puberty.
Each primary oocyte is surrounded by a layer of pre-granulosa cells, forming what is known...
The Menstrual Cycle01:19

The Menstrual Cycle

The menstrual cycle is a recurrent sequence of changes in the uterine endometrium, specifically its functional layer, the stratum functionalis. This cycle prepares the uterus for potential pregnancy. This cycle typically spans 21–35 days, averaging 28 days, and aligns with the ovarian cycle, regulated by fluctuating levels of ovarian hormones, primarily estrogen and progesterone.
The menstrual phase occurs from days 1 to 5 and involves the shedding of the stratum functionalis, as a uterine...

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Related Experiment Video

Updated: Jun 18, 2026

An In Vivo Estrogen Deficiency Mouse Model for Screening Exogenous Estrogen Treatments of Cardiovascular Dysfunction After Menopause
06:18

An In Vivo Estrogen Deficiency Mouse Model for Screening Exogenous Estrogen Treatments of Cardiovascular Dysfunction After Menopause

Published on: August 13, 2019

Menopause, evolution and changing cultures.

Laurence M A Shaw1, Sebastian L J Shaw

  • 1Bridge Centre, London, UK. LMAShaw@aol.com

Menopause International
|November 26, 2009
PubMed
Summary
This summary is machine-generated.

Menopause, an evolutionary adaptation, is now largely vestigial due to increased longevity. This extended postreproductive phase, a hormone deficiency, contributes to increased disease risk and may shift future menopause ages later.

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Last Updated: Jun 18, 2026

An In Vivo Estrogen Deficiency Mouse Model for Screening Exogenous Estrogen Treatments of Cardiovascular Dysfunction After Menopause
06:18

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Published on: August 13, 2019

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Cell-Specific Paired Interrogation of the Mouse Ovarian Epigenome and Transcriptome

Published on: February 24, 2023

Area of Science:

  • Evolutionary biology
  • Reproductive endocrinology
  • Gerontology

Background:

  • Menopause is an evolutionary adaptation from the Pliocene era, likely crucial for survival.
  • Modern human longevity has doubled, extending the postreproductive phase significantly.
  • This extended phase represents a hormone deficiency state, not part of natural human history.

Purpose of the Study:

  • To analyze menopause as a vestigial reproductive strategy in the 21st century.
  • To understand the implications of extended postreproductive life on female health.
  • To explore the evolutionary pressures on reproductive timing and menopause age.

Main Methods:

  • Review of evolutionary biology and human longevity trends.
  • Analysis of reproductive patterns and fertility treatments in later life.
  • Examination of the hormonal changes associated with menopause and aging.

Main Results:

  • Menopause is a vestigial strategy in an era of increased lifespan.
  • Extended postmenopausal duration leads to a hormone deficiency state.
  • Increased incidence of disorders postmenopause is linked to this extended phase.

Conclusions:

  • The extended postmenopausal period is a recent phenomenon with health implications.
  • Modern reproductive trends may favor genes for later reproduction, potentially delaying menopause.
  • Future generations may experience increased fertility in their 40s and a later menopause age.