Osteoclast can be considered a specialized macrophage arising from the bone marrow stem cell.

In addition to osteoblasts, adipocytes are also derived from the mesenchymal progenitor cell.

The common property of annexin and osteocalcin is their ability to bind calcium.

Bone remodeling is controlled by the interplay of RANKL and OPG.

Osteoprotegerin activates osteoclast.

Long-term glucocorticoid administration is a risk factor for osteoporosis.

Hydroxylation of calciol to calcidiol occurs in the liver and refers to position 1.

Parathyroid hormone receptors are on the surface of the osteoclast.

The presence of osteocalcin in the urine indicates increased bone degradation.

Some bone morphogenetic factors (proteins) may have enzyme activity.