describe collagen fibres
collagen. The major protein of the white fibres of connective tissue, cartilage, tendons and bones. It is strong, fibrous, insoluble in water, rich in glycine and proline and can be hydrolysed into gelatin by boiling.he major protein of the white fibers of connective tissue, cartilage, and bone; insoluble in water but can be altered to easily digestible, soluble gelatins by boiling in water, dilute acids, or alkalies. See also: collagen fiber. Synonym(s): ossein, osseine, ostein, osteine.