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| Title: | Web Tutorial 19.1 The Endocrine System |
| Caption: | The endocrine system is a specialized group of organs that produce hormones—chemical signals that circulate through body fluids and affect distant target cells. Hormones are present in tiny concentrations but have huge effects on their target cells. This tutorial explores the anatomy of the human endocrine system and focuses on some of the hormones involved in sex differences. |