Human Body Systems

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Across
  1. 2. bone that protects the brain
  2. 4. the exchange of oxygen and carbon dioxide
  3. 7. type of muscle that are found in the heart
  4. 9. controls the body
  5. 10. type of muscle that is connected to bones
  6. 11. first phase of the heart beating
  7. 12. the air only pipe
  8. 13. tiny hair inside the nose
  9. 15. type of muscle that look smooth
  10. 17. carries blood to the heart
  11. 18. carries the blood away from the heart
  12. 20. the most complex part of the brain
Down
  1. 1. bone cells that make new bones
  2. 3. protects the heart and lungs
  3. 5. carries air
  4. 6. second phase of the heart beating
  5. 8. protein that makes bones
  6. 14. where you information is stored
  7. 16. nervous system’s cells
  8. 19. a muscle located in front of the upper arm