Your bones are not finished and done. Osteoclasts keep clearing away old bone so builder cells can lay down fresh new bone.
Drag to turn it around. Use the buttons to zoom in and try things from the lessons.
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Osteoclasts live on the surface of your bones. They are giant cells.
An osteoclast forms when several smaller cells join into one. That is why it can have many nuclei instead of just one.
One osteoclast can have lots of nuclei. Most of your cells only have one!
This teamwork keeps your bones strong. It also helps a broken bone heal and reshape, and it lets calcium out into your blood when your body needs it.
Press Dissolve old bone on the 3D model, then Builders arrive.