Which bone cell type is primarily responsible for forming new bone tissue during growth and healing?

Which bone cell type is primarily responsible for forming new bone tissue during growth and healing?

• A. Osteoblasts
• B. Osteocytes
• C. Osteoclasts
• D. Chondrocytes

Answer: (A)

Building new bone tissue during growth and healing is carried out by osteoblasts. These cells come from osteoprogenitor cells and move to sites needing bone formation, where they secrete osteoid—the organic bone matrix mostly made of collagen—and promote its mineralization to become hard bone. As they work, some osteoblasts become embedded in the matrix and mature into osteocytes, which maintain bone tissue. In contrast, osteoclasts break down bone as part of remodeling, and chondrocytes form cartilage rather than bone in the early stages of some ossification processes. Therefore, the primary builders of new bone tissue are osteoblasts.

Building new bone tissue during growth and healing is carried out by osteoblasts. These cells come from osteoprogenitor cells and move to sites needing bone formation, where they secrete osteoid—the organic bone matrix mostly made of collagen—and promote its mineralization to become hard bone. As they work, some osteoblasts become embedded in the matrix and mature into osteocytes, which maintain bone tissue. In contrast, osteoclasts break down bone as part of remodeling, and chondrocytes form cartilage rather than bone in the early stages of some ossification processes. Therefore, the primary builders of new bone tissue are osteoblasts.