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  • Some of a baby's bones are made entirely of a special material called cartilage. The cartilage is soft and flexible. During childhood, as you are growing, the cartilage grows and is slowly replaced by bone, with help from calcium.
  • As you get older, bones are made mostly of collagen, a protein that is woven into a flexible framework. Bone also contains calcium phosphate and calcium carbonate, minerals that add strength and harden the framework.
  • Now let's talk about broken bones because even though they are strong, bones can break
  • After the initial break,Within a couple hours, a blood clot forms around it. Inside the blood clot, special cells called phagocytes begin cleaning bone fragments and killing any germs which might have gotten in around the break.
  • Then, a soft callus made mostly of collagen is created around the fracture by another special group of cells called chondroblasts. This stage can last anywhere from 4 days to 3 weeks.
  • Next, a hard callus forms as osteoblast cells create new bone, adding minerals to make it hard. This stage typically begins 2 weeks after the break.
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