Questions: Which of the following are considered to be bonebuilding cells? fibroblasts osteoclasts osteoblasts osteocyte

The answer is the third one: osteoblasts.

Explanation for each option:

1. Fibroblasts: These are not bone-building cells. Fibroblasts are primarily involved in the synthesis of extracellular matrix and collagen, playing a crucial role in wound healing and tissue repair.

2. Osteoclasts: These are not bone-building cells. Osteoclasts are responsible for bone resorption, which is the process of breaking down bone tissue, allowing for the release of minerals and the remodeling of bone.

3. Osteoblasts: These are bone-building cells. Osteoblasts are responsible for the formation of new bone tissue by producing the bone matrix and facilitating its mineralization.

4. Osteocyte: These are not primarily bone-building cells. Osteocytes are mature bone cells that originate from osteoblasts. They maintain the bone matrix and communicate with other bone cells to regulate bone remodeling, but they do not actively build new bone.

In summary, osteoblasts are the cells specifically responsible for building bone.