ANATOMY

Detailed explanation-1: -Which of the Proteins listed below IS NOT a myofibril protein? Trypsin is not a myofibril protein.

Detailed explanation-2: -Myofibrillar proteins are composed of myosin, actin, and regulatory proteins such as tropomyosin, troponin and actinin (Fig. 6.3).

Detailed explanation-3: -Myofibrils constitute the contractile system, which consists of four complex proteins: myosin, actin, tropomyosin, and troponin.

Detailed explanation-4: -Troponin and tropomyosin are two proteins that are present on the thin filaments of the muscle cells and help in the contraction of muscles. However, they have opposite functions. While troponin promotes muscle contraction, tropomyosin blocks muscle contraction.

Detailed explanation-5: -Tropomyosins. The best-studied allergen from crustacean and molluscan shellfish species, tropomyosin, is an -helical structural protein that is found in both muscle and nonmuscle cells and is highly conserved across the animal kingdom.