Respiratory and Circulatory

3. which blood cell attacks invading pathogens?
5. serves as a transport system providing nutrients for cells and also carries chemical messages
7. type of cancer that often begins in a lymph node
11. also known as the windpipe
14. the waste product that we breathe out
19. the tiniest blood vessels
20. happens when a blood vessel in the brain becomes blocked or bursts
21. small, bean-shaped organs that remove pathogens and dead cells
22. organ that pumps blood around your body

1. this carries gases, nutrients and wastes through the body
2. tubes that blood travels through
4. the circulation of blood helps your body maintain this
6. system that works with the circulatory system to move fluids around your body
8. part of blood that helps blood clump up so you stop bleeding
9. condition in which airways are narrowed and it is hard to breathe
10. without this brain cells die, we also breathe this in
12. carries blood back to the heart
13. carries blood AWAY from the heart
15. soft tissue inside bones where blood cells are produced
16. system that includes the heart, blood and blood vessels
17. the fluid part of blood
18. small lymphatic organs at the back of your throat that defend the body against infection