What is responsible for the flexibility of bone?

The flexibility of bone is primarily due to its composition, which includes a combination of organic and inorganic materials. Collagen, a protein that provides tensile strength, constitutes a significant part of the organic matrix, allowing bones to bend slightly without breaking. Additionally, hydroxyapatite, the mineral component, contributes to the rigidity and strength of bones while still permitting some degree of flexibility. This unique structure allows bones to withstand various stresses and strains during movement.