Organ system crossword

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Across
  1. 2. thin membrane that materials diffuse across
  2. 5. carries oxygen and carbon dioxide
  3. 7. arm muscle
  4. 10. supports body and allows movement
  5. 12. brain lobe that controls movement
  6. 13. cells that form a scab
  7. 15. allows oxygen to enter cells
  8. 16. brain and spinal cord
  9. 17. carries air from nose to lungs
  10. 21. many subsystems that control muscles, alertness
  11. 22. supplies materials to every cell
  12. 23. bone supporting all organs
  13. 25. nerve cell
Down
  1. 1. extract oxygen from air
  2. 3. related to the lungs
  3. 4. what organ systems work for
  4. 6. protects brain
  5. 8. skin hair and nails
  6. 9. controls muscle movements
  7. 11. carries blood away from heart
  8. 14. leg bone
  9. 18. largest artery leaves left ventricle
  10. 19. where oxygen is passed into blood
  11. 20. back of arm muscle
  12. 24. organ made of alveoli