Human Body Systems

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