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