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