Endocrine System
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WHAT IS A HORMONE? Simply put, it is a chemical messenger that is produced somewhere in the body but travels through the blood stream to affect change somewhere else in the body. The endocrine system has glands all throughout the body which secrete hormones to control the functions of organs.
There are 2 general types of hormones: STEROID AND NONSTEROID HORMONES. These hormones affect their target cells in different ways.

Click on the following link to see an animation of the differences.

Click this link to see a summary of the differences.