What are human skeletons made out of? Bone. What is connected to the bone? Muscle. What layer rests on top of muscle to protect your body? Skin. Bones, muscle, and skin form the foundation of your body.

The person in the above figure is moving. How do his bones help him to move? How are his muscles working with his bones? What would happen if the he did not have skin? What would happen if his bones were removed? Human bodies cannot work without a collection of different tissues and organs. If you remove one, the others will not operate in the same way.

While reading this chapter, think about the individual functions of bones, muscles, and skin. But also remember to consider how they work together to form a whole human.

CK-12 Foundation, Biology. http://creativecommons.org/licenses/by-nc-sa/3.0/