Support systems and movement

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