List the names of 10 body systems and the principle role of each in serving the rest of the body.

1. Circulatory system; transports oxygen, waste, nutrients, hormones, heat, and other substances around the body.

2. Respiratory system; responsible for gaseous exchange, that is it brings oxygen into the body and gets rid of carbon dioxide.

3. Endocrine system; controls the body functions using chemicals messengers known as hormones.

4. Skeletal system; provides shape and structure to the body and allows for movement, protects vital organs and produces blood cells.

5. Nervous system; receives incoming information and sends messages to the body about how to respond.

6. Immune system; fights disease or infections causing pathogens such as viruses, fungi, and bacteria.

7. Digestive system; Breaks down food into smaller molecules and absorbs these nutrients into the body.

8. Reproductive system; produces sex cells, produces sex hormones and nurtures the unborn baby.

9. Muscular system; allows for movement of the body and keeps the head in position and also provides heat.

10. Urinary system; Cleanses the blood, gets rid of body wastes and maintains salts and water balance.