Final answer:
A callus is actually a sign of bone healing, consisting of cartilage and new bony tissue that bridges the gap between broken bone ends and is later remodeled into mature bone tissue. Therefore, the correct answer is True.
Step-by-step explanation:
A callus is not made of dead cells; rather, it is a part of the bone healing process. Specifically, when a bone fractures, the body forms a callus consisting of cartilage and new bony tissue. This callus helps to bridge the gap between the broken bone ends. As the healing process progresses, this callus is eventually remodeled into mature bone tissue through the action of osteoclasts (which break down old or excess bone) and osteoblasts (which build new bone), a process that can continue for several months.
During this remodeling phase, any excess material on the exterior of the bone and within the medullary cavity is removed, and compact bone is added. This transformation of the callus into a structure that closely resembles the original, unbroken bone ensures the return of normal bone function. Therefore, the statement that a callus is a sign of bone healing is True.