Human Body Systems

3. a sheet of muscle below your ribcage which controls the expanding and contracting of the chest
6. bag-like organs that expand as air is taken in then contract as air is released
8. type of digestion that changes food into a different substance
10. tiny air sacs in the lungs that allow the exchange of oxygen and carbon dioxide between the lungs and bloodstream
13. the system primarily used for breaking down food for energy
14. releases liquid waste, urine, from the body
16. body system that transports nutrients, sugars, and oxygen to cells and removes waste
19. blood vessels that carry oxygen-rich blood to the rest of the body
20. liquid substance of blood that carries oxygen, nutrients, carbon dioxide
22. holds liquid waste until it is released from the body
23. the body system that removes waste from the body

1. transports oxygen, carbon dioxide, and other nutrients to the cells in the body
2. very narrow blood vessels that allow gas exchange at a cellular level
4. blood vessels that carry oxygen-poor blood back to the heart
5. the process of breaking down food
7. cell fragments that form clots to stop bleeding from a cut
9. main organ in the excretory system that removes liquid waste from the body
11. cells that fight bacteria and viruses
12. type of digestion that breaks food into smaller pieces
15. the system responsible for exchanging gases in the body
17. a stiff-walled tube of the respiratory system that connects the pharynx with the lungs
18. connecting tube from kidney to bladder
21. main organ of the circulatory system; used to pump blood throughout the body