HUMAN BODY SYSTEM CROSSWORD PUZZLE

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Across
  1. 5. this blood cell is responsible for carrying O2 to body cells
  2. 6. there are 24 of these in the body
  3. 10. system that includes the lungs
  4. 11. thick walled vessel that carries blood from the heart to the body
  5. 12. type of joint that can only move in one directional plane
  6. 15. one of two bones in the forearm
  7. 16. longest bone in the body
  8. 18. commonly called the "windpipe"
  9. 20. smallest bone in the body
Down
  1. 1. air filled spaces in the skull
  2. 2. this kind of matter is found on the outside of the brain
  3. 3. "master gland"
  4. 4. bones at the base of the hand
  5. 7. valve that is between the left atrium and ventricle
  6. 8. small spiral bone in the inner ear
  7. 9. this kind of muscle is only found in the heart
  8. 13. main part of the nervous system
  9. 14. this tendon connects the muscles in the back of your calf to your heel bone
  10. 17. other bone in the forearm
  11. 19. this blood cell fights infection