Across
- 5. a throbbing as blood is pumped through the arteries
- 6. arteries become smaller and smaller
- 7. two branches of the windpipe
- 9. blood is pumped out
- 11. blood enters your heart through these chambers
- 12. carries blood back to your heart
- 15. tiny air sacks in your lungs
- 16. a pale yellow liquid
- 17. system gets rid of carbon dioxide
- 18. two muscle powered pumps that work side by side
- 19. carriers blood away from the heart
- 22. in blood keep you from bleeding too much
Down
- 1. blood cells fight off disease
- 2. lets blood in and out in one direction
- 3. air travels to the lungs through this
- 4. vessels blood travels through tubes of various sizes
- 6. system transports needed substance throughout your body
- 8. an educated guess
- 10. two large lightweight respiratory organs of the body
- 13. large band of muscle that controls the size of the chest cavity
- 14. un changing variable
- 20. factors any attribute
- 21. blood cells specialized to carry oxygen and carbon dioxide