What is the primary function of osteoblasts in bone tissue?

Osteoblasts play a crucial role in the formation of new bone tissue. They are specialized cells responsible for synthesizing and secreting the components of the bone matrix, particularly collagen and other proteins, which are essential for bone structure. Once they are surrounded by the matrix they produce, they differentiate into osteocytes, which embed within the bone and maintain the bone tissue.

This process of new bone formation is vital for bone growth, repair, and remodeling. Osteoblasts are particularly active during periods of growth (such as childhood and adolescence) and also respond to mechanical stress on bones, helping to adapt and build stronger bone in response to overloading.

In contrast, the other options refer to processes or functions not primarily associated with osteoblasts. For instance, while the absorption of old bone tissue is the role of osteoclasts, regulating calcium levels is primarily managed by hormones and other cell types, and providing structural support is a function of the bone as a whole rather than a role of a specific cell type.