Question

what is an osteoblast? a bone cancer cell. a bone cell that is involved in the resorption of bone tissue. a mature osteoblast that becomes trapped in the bone matrix. a bone cell that is involved in building bone tissue.

Explanation:

Osteoblasts are cells responsible for bone formation. They secrete the extracellular matrix components that contribute to building new bone tissue. They are not related to bone - cancer, bone - resorption (that's osteoclasts), and a mature osteoblast trapped in the bone matrix is an osteocyte.

Answer:

D. A bone cell that is involved in building bone tissue.