Question

multiple select question select all that apply the protein filaments found in muscle fibers that allow for contraction are myosin keratin actin tryptophan

Explanation:

Myosin and actin are the two main protein filaments in muscle fibers involved in contraction. Keratin is a protein in hair, nails, etc., not related to muscle contraction. Tryptophan is an amino - acid, not a muscle - contraction related protein filament.

Answer:

myosin, actin