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Enzyme resorb bone by mature osteoclasts

Bone resorption plays an important role in bone modeling and remodeling. Osteoclasts are the cells responsible for the bone resorption. Osteoclasts are located on endosteal bone surfaces and on the periosteal surface beneath the periosteum. They are multinucleated giant cells highly polarized in their morphology and function. Among the proximal surface, the membrane and the area of the cytoplasm directly oppose to the bone surface, which are specialized into two regions. A central region consisting of many irregular cytoplasmic processes and infoldings, the ruffled border, is known to be the active site of bone resorption.
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Bone Cells

Enzyme resorb bone by mature osteoclasts
Enzyme resorb bone by mature osteoclasts
Enzyme resorb bone by mature osteoclasts
Enzyme resorb bone by mature osteoclasts
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Osteoclast - Wikipedia

As the only cells definitively shown to degrade bone, osteoclasts are key mediators of skeletal diseases including osteoporosis. Bone forming osteoblasts, and hematopoietic and immune system cells, each influence osteoclast formation and function, but the reciprocal impact of osteoclasts on these cells is less well appreciated. Here, we highlight functions osteoclasts perform beyond bone resorption. First, we consider how osteoclast signals may contribute to bone formation by osteoblasts and the pathology of bone lesions, such as fibrous dysplasia and giant cell tumors. Second, we review the interaction of osteoclasts with the hematopoietic system, including the stem cell niche and adaptive immune cells. Connections between osteoclasts and other cells in the bone microenvironment are discussed within a clinically relevant framework. Bone is a composite tissue of protein and mineral, which undergoes continual remodeling to grow, heal damage, and regulate calcium and phosphate metabolism.
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[Osteoclasts in bone metabolism].

There are two categories of bone cells. Osteoclasts are in the first category. They resorb dissolve the bone.
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