Human body crossword

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Across
  1. 2. the protein that makes up bones
  2. 5. The heart is a
  3. 6. air enters through your nose or
  4. 8. hold the skeleton together
  5. 9. The walls of the trachea are strengthened by stiff rings of
  6. 10. the trachea splits into how many air tubes
  7. 12. how much does the human body weight
  8. 13. How long is the spinal cord
  9. 15. Carries blood away from the heart
  10. 16. the type of muscle found in the heart
  11. 17. The heart sends
Down
  1. 1. the lungs are apart of what system
  2. 3. protects the brain
  3. 4. the largest part of the brain
  4. 6. pull on the joints allowing us to move
  5. 7. Carry blood back to the heart
  6. 9. the human brain is incredibly
  7. 11. humans have how many types of muscles
  8. 14. a pathway for messages between the brain and the body
  9. 17. protects organs in our body