Which type of bone is more metabolically active and involved in the process of remodeling?

• A. Cortical bone
• B. Trabecular bone
• C. Compact bone
• D. Spongy bone

Answer: (B)

Trabecular bone is the correct answer because it is more metabolically active and plays a significant role in the remodeling process. This type of bone, also known as spongy bone, is found primarily at the ends of long bones, within the interior of vertebrae, and in the pelvis. Its structure consists of a network of trabeculae (thin, rod-like elements), which give it a lighter weight and greater flexibility compared to the denser cortical bone.

The metabolic activity within trabecular bone is higher due to its larger surface area relative to its volume, allowing for greater interaction with blood vessels and higher turnover rates. This means it is more responsive to mechanical stress and changes in hormonal signals, making it crucial in processes like healing and adapting to changes in body weight or activity level.

The role of trabecular bone in remodeling is essential for maintaining bone strength and integrity. Calcium is exchanged between trabecular bone and the bloodstream, which is vital for maintaining mineral homeostasis in the entire skeletal system. Its dynamic nature also plays a significant part in conditions such as osteoporosis, where the balance between bone resorption and formation is disrupted.

In contrast, cortical bone, which makes up the outer layer of bones and provides structural support