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Related Concept Videos

Functions of Thyroid Hormones01:18

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The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
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Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
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The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
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Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the...
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Genetic Variation01:25

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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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Related Experiment Video

Updated: Oct 19, 2025

An Ex vivo Culture System to Study Thyroid Development
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Reinterpreting patterns of variation in human thyroid function: An evolutionary ecology perspective.

Sarai Keestra1,2, Vedrana Högqvist Tabor3, Alexandra Alvergne1,4

  • 1School of Anthropology & Museum Ethnography, University of Oxford, Oxford, UK.

Evolution, Medicine, and Public Health
|September 24, 2021
PubMed
Summary

Thyroid disorders affect 200 million globally. This review explores the evolutionary and ecological factors causing normal variation in thyroid function, crucial for understanding disease onset and personalized care.

Keywords:
autoimmune thyroid diseasesevolutionary ecologyevolutionary medicinehyperthyroidismhypothyroidismthyroid hormones

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Area of Science:

  • Endocrinology
  • Evolutionary Biology
  • Ecological Medicine

Background:

  • Thyroid disorders impact 200 million people worldwide, disproportionately affecting women.
  • Limited research exists on the causes of variation in human thyroid function across populations, individuals, and lifespan.
  • Current diagnostic reference intervals may not adequately capture normal physiological variation, complicating disease identification.

Purpose of the Study:

  • To stimulate research into the causes of variation in thyroid phenotypes.
  • To critically assess existing reference intervals for thyroid function diagnosis and treatment.
  • To propose a framework for understanding normal variation in thyroid function.

Main Methods:

  • Review of biomedical literature on thyroid imbalance and diagnostic criteria.
  • Proposal of an evolutionary ecological framework integrating phylogenetic, genetic, ecological, developmental, and physiological factors.
  • Formulation of testable predictions regarding environmental influences on thyroid disorders.

Main Results:

  • Existing reference intervals for thyroid function may require re-evaluation across diverse populations and individuals.
  • An evolutionary ecological framework offers a comprehensive approach to understanding normal thyroid function variation.
  • Environmental factors, including diet, ecological disruptions, infections, and stress, are implicated in thyroid disease onset.

Conclusions:

  • Understanding the multi-level causes of thyroid variation is essential for accurate diagnosis and personalized patient care.
  • Further research is needed to elucidate the interplay between environmental challenges and individual circumstances in thyroid health.
  • An evolutionary ecological perspective can enhance our comprehension of thyroid disorders and inform public health strategies.