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There are cells called osteocytes and osteoblasts and osteoclasts always crawling around inside and around bones. They constantly dissolve away bits of bone and constantly lay down new bits of bone. When a bone breaks the physical stresses and chemical signals attract more of these cells to lay down more new bone. Where the two broken ends of a bone touch the new bone laid down "glues" them together. Over time all the bone around the break gets dissolved and rebuilt bit by bit, effectively erasing the crack.

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15y ago
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11y ago

They may hurt a little but if you drink milk it will help grow more bone cells to help make it heal faster. And they undergo pain and other things try searching this and checking other sites for more info but thats all that I know from when I broke my arm

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14y ago

Bone has a cell called osteoblast which builds the bone. To prevent too much bone, cells called osteoclast destroys the bone and reabsorbs the calcium.

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10y ago

Older peoples bones break easier and heal slower because they arent as strong and their bones have probably been broken before so the are softer and more tender.

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7y ago

Bone building cells (osteoblasts) live within bone and are constantly rebuilding it.

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Q: What changes do broken bones undergo as they heal?
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