Body Systems

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Across
  1. 2. Contracts to bend a limb at a joint
  2. 3. A passageway for food and air
  3. 4. The framework of protein that bones are made up of
  4. 6. Carry blood back to the heart
  5. 9. Part of the central nervous system
  6. 12. Bone that looks like a sponge
  7. 13. Tiny hairs that filter out dust and particles
  8. 14. Circulation from the heart to lungs, repeat
  9. 15. Found in the heart
  10. 18. Makes and repairs new/old bone
  11. 19. Left, Right, pump blood out of the heart
  12. 20. This muscle contracts when you bend your elbow
Down
  1. 1. Takes longer to contract than skeletal muscles
  2. 5. Millions of these tiny air sacs are in our lungs
  3. 7. Tiny cells in the nervous system
  4. 8. The outer layer of the cerebrum
  5. 10. Strengthens the walls of the trachea
  6. 11. Carries messages from sensory organs
  7. 16. Carry blood away from the heart
  8. 17. Fastens bones to other bones