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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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