Circulatory System

4. this part of blood helps you heal when you get a cut
9. the small, upper chambers of the heart
10. fluid that carries nutrients, oxygen, carbon dioxide, cellular wastes, and other materials throughout the body
11. arteries usually carry this kind of blood
14. very tiny blood vessels that exchange gases and nutrients with the lungs and body cells
15. blood vessels that carry blood to the heart
16. this type of blood cell protects the body from pathogens
17. where gases are exchanged between the body and the environment

1. the liquid part of blood
2. the large, lower chambers of the heart
3. this type of blood cell carries oxygen
5. tiny sacs where gases can pass between the lungs and blood in the capillaries
6. these one-way "doors" prevent blood from flowing backward through your circulatory system
7. tubes that travel throughout the body carrying blood with nutrients, oxygen, and waste products
8. blood vessels that carry blood away from the heart
12. muscular organ that pumps blood through the blood vessels
13. large muscle that causes inhalation and exhalation