Question

the white fibers are chemically composed of

Answer 1

. a fibrous insoluble protein consisting of bundles of tiny reticular fibrils that combine to form the white glistening inelastic fibers of the tendons, the ligaments, and the fascia. It is found in connective tissue, including skin, bone, ligaments, and cartilage.

Answer 2

White fibres are made up of collagen protein.
Yellow ones out of elastin protein. :)