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What is the Endocrine System?

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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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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.
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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.

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Related Experiment Video

Updated: Jul 18, 2026

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The endocannabinoid system.

Steven T Boyd¹

¹Xavier University, Natchitoches, Louisiana 71457, USA.

Pharmacotherapy

|November 28, 2006

Summary

The endocannabinoid system, involving cannabinoid-1 receptors, is linked to obesity and cardiometabolic risk. This system influences fat accumulation and food intake, impacting health outcomes.

Area of Science:

Physiology
Endocrinology
Metabolism

Background:

The endocannabinoid system (ECS) plays a crucial role in regulating various physiological processes.
Cannabinoid-1 receptors (CB1Rs) are widely distributed and implicated in metabolic disorders.
Adipose tissue is now recognized as an active endocrine organ releasing adipokines.

Purpose of the Study:

To explore the link between the endocannabinoid system and obesity.
To understand the role of adipose tissue in cardiometabolic risk.
To investigate the influence of ECS activity on metabolic health.

Main Methods:

Review of current literature on the endocannabinoid system.
Analysis of studies investigating cannabinoid-1 receptor distribution and function.

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Examination of research on adipose tissue endocrine functions and adipokines.

Main Results:

Cannabinoid-1 receptors are present throughout the body and associated with obesity and cardiometabolic risk.
Elevated ECS activity correlates with increased food intake and fat accumulation.
Adipokines released by adipose tissue significantly influence cardiometabolic risk factors.

Conclusions:

The endocannabinoid system is a key regulator of energy balance and metabolic health.
Dysregulation of the ECS contributes to obesity and associated cardiometabolic complications.
Targeting the ECS may offer therapeutic strategies for metabolic diseases.