Question

based on what you know of the relationship between the thick and the thin filaments, what would happen if a disorder existed that caused a person to produce no tropomyosin? the muscle would be weaker than normal. the muscle tissues would never be able to relax. the muscle would never contract. actin will spontaneously fall apart.

Explanation:

Tropomyosin covers the myosin - binding sites on actin in relaxed muscle. Without tropomyosin, myosin heads would bind to actin continuously. This prevents muscle relaxation as there's no blocking of the binding sites. Muscle weakness (first option) doesn't directly follow from lack of tropomyosin's main function. Muscle contraction (third option) is possible as the binding sites are exposed (but then can't stop). Actin doesn't spontaneously fall apart (fourth option) without tropomyosin; it's about binding regulation.

Answer:

The muscle tissues would never be able to relax.