Why do bones heal after breaking?
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Answer: Bone cells rebuild the broken area
Bone cells rebuild the broken area ✓ — Correct! Bone healing (fracture repair) happens in stages: (1) blood clot forms at break, (2) cells called osteoblasts produce new bone matrix, (3) soft callus forms (cartilage), (4) hard callus forms (woven bone), (5) bone remodels to original strength over months. Casts immobilize bones so healing occurs properly. Bones have remarkable regenerative ability unique among hard tissues!
Bones glue themselves back together — Wrong. Bones don't 'glue' back—they actively regenerate. Specialized cells called osteoblasts produce new bone matrix that rebuilds the break. The healing process involves blood clots, cartilage formation (soft callus), then new bone deposition (hard callus), and finally remodeling. It's complex tissue regeneration, not simple gluing. Immobilization (casts) provides stability so new bone forms correctly.
Broken bones grow new bones nearby — Wrong. Bones don't grow new separate bones—they repair the break site directly. Specialized bone cells (osteoblasts) produce new bone matrix that bridges the fracture gap. The process forms a callus (thickened area) that gradually remodels to match original bone structure. With proper immobilization and time (typically 6-8 weeks), the bone heals and regains strength at the break site.