#5: How Hormones Work

Title: Hormones
Author: Steve Parker
Page 17

• Hormones are called chemical messengers because they carry a specific or certain message or instruction.
• Hormones flow through the blood and although they always come in contact with many parts of the body, only certain body parts are effected.
• When hormones are more concentrated in an area, the effect on te target will be more productive and will work faster.  
•  Hormones are made out of molecules and are too small to see even with certain microscopes.
• The three main chemical groups of hormones are "amines, peptides and steroids. (they all work in different ways)
• On the skin, there are certain receptors that determine which hormones will affect the cell.
• When the hormone comes into contact with the cell, it "turns on" the production of that cell.
• However, hormones must first pass through the cell membrane.

In this book, Steve Parker explaines what hormones are and how hormones work.  One example that supports this main idea is when the author writes about what hormones are and what they do.  Another example is when the author writes about some of the main hormones in your body.  Finally, the author gives the fact that if hormones are less concentrated in an area they are targeting, there will be a smaller effect on that area.  These ideas are similar to my research of hormones in biology class because they both deal with what hormones are and how they work.