Across
- 4. vessels that leave the heart
- 6. flap of skin that helps prevent choking
- 7. thin sheet of muscle that relaxes during inhalation
- 8. chambers that gives blood stronger push
- 10. send message to brain from cells
- 13. send message to muscles from brain
- 15. chemicals that speed up digestion
- 17. chambers where blood returns to heart
- 18. the process of breaking down food so it can be used by body
- 19. chemical messengers of the body
Down
- 1. liquid stored in the bladder
- 2. the wind tube
- 3. so small blood cells travel through single file
- 5. movement of air in to and out of the body
- 8. vessels that return blood to the heart
- 9. use of antibodies to fight a pathogen
- 11. tiny tubules in kidneys
- 12. disease causing invader
- 14. the exchange of oxygen and carbon dioxide
- 16. the process of removing waste
- 17. chemical produced by foreign organism