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Related Concept Videos

Regulation of Hormone Secretion01:19

Regulation of Hormone Secretion

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 stimuli,...
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Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
Chemical Signaling in the Endocrine System01:08

Chemical Signaling in the Endocrine System

A signaling cascade is a series of events that facilitates the transmission of information within or between cells, culminating in a targeted response in the recipient cell. As chemical messengers, hormones are pivotal in initiating and modulating these intricate signaling cascades based on their solubility.
Lipid-soluble hormones, such as steroid hormones, demonstrate an intracellular action. These hormones traverse cell membranes due to their lipid nature. Once inside the target cell, they...
An Overview of the Endocrine System01:10

An Overview of the Endocrine System

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.
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Target Cell Response to Hormones01:22

Target Cell Response to Hormones

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...
Structures of the Endocrine System00:59

Structures of the Endocrine System

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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Related Experiment Video

Updated: Jul 17, 2026

Methods to Test Endocrine Disruption in Drosophila melanogaster
09:43

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Published on: July 3, 2019

Endocrine disruption comes into regulatory focus.

D Baltz1

  • 1Commonweal, Bolinas, CA 94924, USA.

New Solutions : a Journal of Environmental and Occupational Health Policy : NS
|January 9, 2007
PubMed
Summary

Federal laws in 1996 prompted endocrine disruption scrutiny. The Endocrine Disruptor Screening and Testing Advisory Committee (EDSTAC) developed a program, but faces challenges like funding and scientific questions.

Area of Science:

  • Environmental Toxicology
  • Endocrinology
  • Regulatory Science

Background:

  • Federal laws enacted in 1996 increased regulatory attention on endocrine disruption.
  • The U.S. Environmental Protection Agency (EPA) established the Endocrine Disruptor Screening and Testing Advisory Committee (EDSTAC).

Purpose of the Study:

  • To develop recommendations for a screening and testing program to assess chemical potential for hormone disruption.
  • To address the threat of endocrine disruption through a structured societal response.

Main Methods:

  • Convening the Endocrine Disruptor Screening and Testing Advisory Committee (EDSTAC).
  • Gathering input from diverse constituencies during public meetings.
  • Developing a consensus report with recommendations for a screening and testing program.

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In vivo Characterization of Endocrine Disrupting Chemical Effects via Thyroid Hormone Action Indicator Mouse
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Last Updated: Jul 17, 2026

Methods to Test Endocrine Disruption in Drosophila melanogaster
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Methods to Test Endocrine Disruption in Drosophila melanogaster

Published on: July 3, 2019

Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants
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Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants

Published on: March 6, 2018

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04:14

In vivo Characterization of Endocrine Disrupting Chemical Effects via Thyroid Hormone Action Indicator Mouse

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Main Results:

  • The EDSTAC consensus report (September 1998) signaled endocrine disruption as a significant threat requiring societal action.
  • The proposed program is expected to generate substantial new toxicological data.
  • Identified shortcomings include inadequate low-dose testing and lack of early developmental exposure assays.

Conclusions:

  • Implementation of the EPA's endocrine disruptor program faces hurdles such as funding, scientific validation, and political will.
  • Public engagement is crucial for commenting on and nominating chemicals for the program.
  • Addressing endocrine disruption reveals limitations in traditional risk assessment, particularly the concept of a 'safe' exposure level.