Systems

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Across
  1. 3. Nares, paired external openings
  2. 9. second chamber of the heart
  3. 10. Sends signals between body parts
  4. 11. System that provides movement
  5. 12. "Voice box"
  6. 15. circulates blood carrying oxygen
  7. 17. Removal of waste from homeostasis
  8. 19. Largest portion of muscle
Down
  1. 1. Each animal has one
  2. 2. long fiber like structures
  3. 4. Long bundle of nervous tissue
  4. 5. Firm tissue that isn't as hard as bone
  5. 6. Controls movement of internal organs
  6. 7. Uses oxygen gets rid of carbon dioxide
  7. 8. Support and protection (vertebrae)
  8. 9. first chamber of the heart
  9. 13. Relatively thin and flat protects organs
  10. 14. Often as big around as they are long
  11. 16. Each animal has two
  12. 18. Makes up the heart