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Go deep under the skin to learn about how the body heals. In this Crash Course, inflammatory responses and other chemical reactions are explained in depth.

Skin is the largest organ of the body. It has an important job to protect the body from the outside world. It releases antibacterial chemicals that keep bad germs from entering the body. There are three layers to skin. The epidermis layer’s job is to alert the immune system if bad germs get into the body.

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Making Connections


Have you ever healed from an injury? How long did it take?


Have you read any other books about your body before? Did you learn anything different in them?


Are there people or groups who can help with healing? What are they like?

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