How do osteoclasts contribute to maintaining bone health?

• A. By lining the surfaces of bones
• B. By synthesizing the bone matrix
• C. By resorbing old bone
• D. By protecting against fracture

Answer: (C)

Osteoclasts are specialized cells that play a crucial role in bone remodeling by resorbing old or damaged bone tissue. This resorption process is essential for maintaining bone health and balance within the skeletal system. As bones undergo continuous remodeling, osteoclasts break down bone tissue to allow for the replacement and repair of bone. This activity helps maintain appropriate bone density and strength by removing outdated bone material, thus providing space for osteoblasts, which are the cells responsible for building new bone.

The function of osteoclasts is balanced by osteoblasts and osteocytes, ensuring that bone mass and integrity are preserved throughout a person's life. The resorption of old bone by osteoclasts is particularly important when bones are subjected to stress or injury, as it allows the skeletal system to adapt and heal effectively. In this way, osteoclasts contribute significantly to the overall health and resilience of bones.