Support systems and movement

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Across
  1. 2. I am often found in a birdcage
  2. 3. Ends of fingers and toes
  3. 5. Exoskeletons are made of this
  4. 7. short bone
  5. 9. I am inside your body
  6. 10. Knee cap
  7. 11. You can also call me a cavity
  8. 12. A tarsal that is in the middle
  9. 13. A rigid girdle
  10. 15. Irregular bone
  11. 18. You can hang things on this skeleton
  12. 19. A type of joint that resembles a door opening
Down
  1. 1. Reduces the loss of water from the body
  2. 4. Also known as your shoulder blade
  3. 6. I am elastic and bendable
  4. 8. We have exoskeletons
  5. 14. You could put a tie around me!
  6. 16. This skeleton gives central support to the body
  7. 17. Attached to a socket
  8. 19. Skeletal structure with fluid-filledchambers