Body system

3. a colorless, odorless reactive gas, the chemical element
5. found on each side of your chest
10. the lower part of the alimentary canal from at the end of the stomach
11. what covers the lungs
12. the number of bones in your body
16. two-headed muscle of the arm
18. the inside of a compact bone
19. the internal organ in which the major part of the digestion of food occurs
20. the path way for air

1. a short loop that runs the heart to the lung
2. what the heart pumps through the body
4. where the food travels
6. the number of mussels in your body
7. the weight of your brain
8. an organ that helps you breath
9. pumps the blood through the circulatory system
13. protected organs and is a part of the skeletal system
14. muscles A large group of muscles in the front of the abdomen that assists in the regular breathing movement
15. runs down through the back from the brain
16. marrow in side of most bones
17. tissue what muscles are made of