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Related Concept Videos

Structures of the Endocrine System00:59

Structures of the Endocrine System

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The intricate framework of the endocrine system encompasses a diverse array of glands, with their target tissues and organs strategically distributed throughout the body. Central to this network are the endocrine glands, specialized structures that lack ducts and release hormones directly into the interstitial fluid. Notably, the hypothalamus, a vital neuroendocrine organ situated in the brain, governs neural functions and serves as a potent source of hormonal regulation. Near the hypothalamus...
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An Overview of the Endocrine System01:10

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The endocrine system, a complex network of glands, orchestrates physiological balance within the body through the production and secretion of hormones. These hormones are chemical messengers in intercellular communication, acting as conduits between the secretory cells and distant target sites. They traverse the circulatory system by being released into the extracellular fluid, and their impact is specific to cells possessing receptors for a particular hormone.
The endocrine system collaborates...
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Target Cell Response to Hormones01:22

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Hormones intricately bind to receptors on the surface or within target cells, initiating a cascade of cellular responses.
Notably, the cellular response can be regulated by altering the number of receptors expressed in the cell. For example, prolonged exposure to elevated hormone levels results in a gradual decline or down-regulation in the number of receptors for that specific hormone on the cell surface. Conversely, in response to low hormone levels, cells may use up-regulation, producing an...
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The Endocrine System01:29

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The endocrine system is an extensive network of glands – organs or tissues in the body that create chemicals that control many bodily functions, that secrete hormones, which are chemical messengers that play essential roles in regulating various bodily functions. These hormones are secreted into the bloodstream and travel throughout the body. They require specific receptors to convey signals to cells possessing these corresponding receptors. This complex signaling mechanism ensures that...
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Regulation of Hormone Secretion01:19

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Regulation of hormone secretion is a finely tuned orchestration driven by various types of stimuli, encompassing neural, humoral, and hormonal signals. Environmental cues instigate neural stimuli, where action potentials traverse nerve fibers to reach their designated targets. An illustrative scenario is the body's response to stress, wherein the sympathetic nervous system releases epinephrine from the adrenal glands, inducing the well-known 'fight or flight' reaction.
Humoral...
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What is the Endocrine System?00:46

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The endocrine system sends hormones—chemical signals—through the bloodstream to target cells—the cells the hormones selectively affect. These signals are produced in endocrine cells, secreted into the extracellular fluid, and then diffuse into the blood. Eventually, they diffuse out of the blood and bind to target cells which have specialized receptors to recognize the hormones.
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Related Experiment Video

Updated: Sep 14, 2025

A Chronic High-Intensity Interval Training and Diet-Induced Obesity Model to Maximize Exercise Effort and Induce Physiologic Changes in Rats
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Exercise training remodels inter-organ endocrine networks.

Cheehoon Ahn1, Andrea L Hevener2, Laurie J Goodyear3

  • 1Translational Research Institute, AdventHealth, Orlando, FL, USA.

Molecular Metabolism
|July 23, 2025
PubMed
Summary

Endurance exercise reshapes how organs communicate through secreted factors. This study reveals key endocrine regulators and signaling pathways, like Wnt, impacted by training, offering insights into exercise-induced adaptations.

Keywords:
Endocrine networkExerciseMoTrPACTissue crosstalk

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Area of Science:

  • Exercise physiology
  • Endocrinology
  • Systems genetics

Background:

  • Exercise triggers widespread molecular changes mediated by circulating factors.
  • The precise endocrine roles of training-induced secreted factors are not fully understood.

Purpose of the Study:

  • To investigate the impact of endurance training on inter-organ endocrine networks.
  • To identify specific secreted factors and tissues involved in exercise-induced adaptations.

Main Methods:

  • Utilized systems genetics approaches with multi-tissue transcriptomics and proteomics data.
  • Analyzed data from endurance-trained rats within The Molecular Transducers of Physical Activity Consortium (MoTrPAC).

Main Results:

  • Eight weeks of training altered endocrine effects across multiple tissue pairs.
  • Subcutaneous white adipose tissue and extracellular matrix factors were identified as key regulators.
  • Secretory Wnt signaling factors were key mediators of exercise-induced endocrine changes.

Conclusions:

  • Developed a comprehensive atlas of exercise-remodeled inter-organ communication.
  • Identified novel exercise-induced secreted factors (exerkines).
  • Provides a valuable resource for understanding exercise's systemic effects.