Bone is alive and always rebuilding. One crew lays down new bone. Another crew dissolves old bone. This constant tug-of-war is called remodeling. Watch it happen, and meet the four cells.
Remodeling in action
Bone remodelingbuild vs break down
The four bone cells
Balance matters. Exercise that puts weight on your bones helps tip it toward building. So does getting enough calcium and vitamin D. Aging, not moving much, and low estrogen tip it toward loss. That can lead to osteoporosis, weak bone full of holes.
📷 Reference image
A real labeled picture to compare with the interactive above.
Bone Cells & Remodeling — Laboratoires Servier, CC BY-SA 3.0 (via Wikimedia Commons)
