Following a fracture of the humerus, which of the following is responsible for producing the majority of the new bone that will reunite the two fragments?: (A) Cancellous bone, (B) Cailage, (C) Compact bone, (D) Periosteum
Answer is D. When the periosteum is torn during a fracture, it supplies cells that develop into osteoblasts and are the major producers of the new bone that reunites the two ends.