Broken Bones and How They Mend 1. What is bone made of? 2. How do bones change to uniquely adapt to stress? 3. What do osteoclasts do? 4. What mechanism do they use? 5. What do osteoclasts do? 6. What mechanism do they use? 7. Why does Lisa not feel pain initially? 8. What is the mechanism? 9. What causes Lisa’s arm to ache and swell? 10. What cells replace skin and bones in a fracture? 11. Why do children scar easier than adults? 12. Why do osteoclasts resculpt bone?