What is the function of organic matrix in bone?

Organic Matrix

Bones contain approximately 35% organic matter, which is found in the form of an organic matrix primarily made up of __________. It constitutes about 90% of the organic content of the bone. Collagen functions to provide flexibility, extensibility, and tensile strength to the bones. This organic matrix is mainly comprised of type _______ collagen. Along with collagen, the matrix also contains other proteins, proteoglycans, lipids, and growth factors.

1) Type I collagen, 2) I