Chapter 21
Endocrine System
![What is the Endocrine System?](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/10875.jpg)
The endocrine system sends hormones—chemical signals—through the bloodstream to target cells—the cells the hormones selectively…
![Types of Hormones](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/10988.jpg)
Hormones can be classified into three main types based on their chemical structures: steroids, peptides, and amines. Their actions are mediated by…
![Cell-surface Signaling](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/10877.jpg)
Hormones—or any molecule that binds to a receptor, known as a ligand—that are lipid-insoluble (water-soluble) are not able to diffuse…
![Feedback Loops](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/10878.jpg)
In most cases, excessive hormone production is prevented by negative feedback—a loop that starts with a stimulus inducing the release of a…
![A Chemical Screening Procedure for Glucocorticoid Signaling with a Zebrafish Larva Luciferase Reporter System](https://cloudfront.jove.com/files/thumbs/50439_t.png)
A Chemical Screening Procedure for Glucocorticoid Signaling with a Zebrafish Larva Luciferase Reporter System
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Glucocorticoid stress hormones and their artificial derivatives are widely used drugs to treat inflammation, but long-term treatment with…
![Preparation of Single-cohort Colonies and Hormone Treatment of Worker Honeybees to Analyze Physiology Associated with Role and/or Endocrine System](https://cloudfront.jove.com/files/thumbs/54240_t.png)
Honeybee workers are engaged in various tasks related to maintaining colony activity. The tasks of the workers change according to their age…
![Assessment of the Effects of Endocrine Disrupting Compounds on the Development of Vertebrate Neural Network Function Using Multi-electrode Arrays](https://cloudfront.jove.com/files/thumbs/56300_t.png)
Assessment of the Effects of Endocrine Disrupting Compounds on the Development of Vertebrate Neural Network Function Using Multi-electrode Arrays
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Bis-phenols, such as bis-phenol A (BPA) and bis-phenol-S (BPS), are polymerizing agents widely used in the production of plastics and numerous…