The Human Body

I need a break from scholarly articles and art, so I decided to research every system of the body. Here are some things I didn't know about the body:

1. Teeth are considered organs not bones.
2. All bones are considered organs as well.
3. Together, the small and large intestines are about 15' long.
4. The appendix is shaped like a worm.
5. The pituitary gland is about the size of a pea and resides in the brain. It is in charge of creating and regulating hormones. I'm just amazed that an organ so small can have such an important task and wreak such havoc.
6. We have an organ in our fetal and childhood development called the thymus that eventually becomes inactive in puberty and is replaced by fatty tissues in adulthood.
7. Fevers and inflammation are not necessarily products of infection, they are the immune system's response to fight and slow down harmful pathogens. 
8. The average person’s skin weighs 10 pounds and has a surface area of almost 20 square feet.
9. Less than 1% of our skin cells help us to sense touch.
10. Our muscle movements are the primary source of body heat.
11. The skull is comprised of 22 bones (21 of them are fused together).
12. I thought bones simply provided a support structure for our bodies, but actually they perform important storage and regulatory functions like releasing calcium into our bloodstream, storing energy, and monitoring sugar levels.

Source: http://www.innerbody.com/