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Osteoclasts and osteoblasts are both types of osteons or bone cells. They differ in their function. An osteoblast will build bone. You can remember it as as osteo"b"last will "b"uild "b"one. An osteoclast, however, is designed to break down bone that is no longer needed. Or "c"ill bone.

The osteoblast lays down bone matrix, which mineralizes and becomes bone. The osteoclast resorbs bone. The delicate equilibrium between both types of cells is key to the health of the skeletal system. No one is more important, and both have a role to play in maintaining the quantity and quality of bone.

Osteoclasts are giant bone-destroying cells. this process is usually activated by the drop of blood calcium levels that cause the parathyroid glands to release PTH (parathyroid hormone) which activates osteoclasts so they break down osteocytes releasing calcium ions into the blood stream.

Both also work in a process called bone remodeling during normal growth or after changes in the type of stress are exposed to.

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