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The Endocrine System

The Endocrine System

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...

What is the Endocrine System?

What is the Endocrine System?

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.

Endocrine Signaling

Endocrine Signaling

Endocrine Signaling

Endocrine Signaling

Endocrine cells produce hormones to communicate with remote target cells found in other organs. The hormone reaches these distant areas using the circulatory system. This exposes the whole organism to the hormone but only those cells expressing hormone receptors or target cells are affected. Thus, endocrine signaling induces slow responses from its target cells but these effects also last longer.

Structures of the Endocrine System

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...

Adrenal Gland Disorders

Adrenal Gland Disorders

Adrenal gland disorders manifest when the production of adrenal hormones deviates from the norm, resulting in either excessive or insufficient concentrations.
Adrenal insufficiency, characterized by insufficient cortisol and aldosterone production, leads to conditions like Addison's disease. This disorder, affecting the adrenal cortex, exhibits symptoms such as skin bronzing, dehydration, low blood pressure, fatigue, and weight loss. Congenital adrenal hyperplasia, a genetic ailment causing...

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Related Experiment Video

Updated: May 6, 2026

Homogeneous Time-resolved Förster Resonance Energy Transfer-based Assay for Detection of Insulin Secretion

Homogeneous Time-resolved Förster Resonance Energy Transfer-based Assay for Detection of Insulin Secretion

Published on: May 10, 2018

[Hand and endocrine diseases].

Jean-Louis Wémeau¹, Amélie Ryndak, Wassila Karrouz

¹Clinique endocrinologique Marc-Linquette, hôpital Claude-Huriez, CHRU de Lille, 4(e) et 5(e) Ouest, 59037 Lille cedex, France.

Presse Medicale (Paris, France : 1983)

|October 24, 2013

Summary

This summary is machine-generated.

Hormones significantly impact hand health, affecting skin, muscles, and joints. Recognizing these hand changes aids in diagnosing various endocrine diseases and diabetes complications.

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A Murine Model of Hemodialysis Access-Related Hand Dysfunction

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Homogeneous Time-resolved Förster Resonance Energy Transfer-based Assay for Detection of Insulin Secretion

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Combined Intravital Microscopy and Contrast-enhanced Ultrasonography of the Mouse Hindlimb to Study Insulin-induced Vasodilation and Muscle Perfusion

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A Murine Model of Hemodialysis Access-Related Hand Dysfunction

A Murine Model of Hemodialysis Access-Related Hand Dysfunction

Published on: May 31, 2022

Area of Science:

Endocrinology
Dermatology
Rheumatology

Context:

Hormonal imbalances can manifest in distinct physical changes in the hands.
The hands serve as a diagnostic indicator for several endocrine disorders.
Understanding these correlations is crucial for clinical practice.

Purpose:

To elucidate the influence of hormones on the physical characteristics of the hands.
To establish the role of hand examination in identifying endocrine diseases.
To highlight specific hand manifestations associated with conditions like Graves' disease, myxedema, hypopituitarism, acromegaly, pseudohypoparathyroidism, and diabetes.

Summary:

Hormones affect hand skin (color, texture) and musculoskeletal components (muscles, tendons, bones, joints).
Specific hand signs correlate with endocrine conditions: hot/moist hands (Graves'), dry/cold hands (myxedema), pale/fine hands (hypopituitarism), broad hands (acromegaly), and brachymetacarpia (pseudohypoparathyroidism).
Diabetes is linked to tendinous/articular retractions and infections like whitlows and nail mycosis.

Impact:

Early recognition of endocrine disorders through hand assessment.
Improved diagnostic accuracy for hormonal diseases.
Enhanced understanding of the systemic effects of endocrine dysfunction on extremities.