What structural feature does spongy bone primarily provide to bones?

What structural feature does spongy bone primarily provide to bones?

• A. To make bones lighter in weight
• B. To increase osteon density
• C. To decrease surface area for remodeling
• D. To increase mineral content

Answer: (A)

Spongy bone is a porous lattice of trabeculae that forms a lightweight framework inside bones. This design reduces the overall mass of the bone while still providing strength, because the lattice can be rearranged to resist stresses from multiple directions. The spaces within the lattice house marrow and capillaries, supporting metabolic needs, but the key structural benefit is the substantial reduction in weight without compromising sturdiness. In contrast, compact bone relies on dense osteons for strength, so increasing osteon density or mineral content isn’t the primary role of spongy bone.

Spongy bone is a porous lattice of trabeculae that forms a lightweight framework inside bones. This design reduces the overall mass of the bone while still providing strength, because the lattice can be rearranged to resist stresses from multiple directions. The spaces within the lattice house marrow and capillaries, supporting metabolic needs, but the key structural benefit is the substantial reduction in weight without compromising sturdiness. In contrast, compact bone relies on dense osteons for strength, so increasing osteon density or mineral content isn’t the primary role of spongy bone.