Question

The thin filament of a myofibril is a complex of three different proteins called ___.

Answer 1

Myofibril:

1. A myofibril is a component of the animal skeletal muscle.
2. These are long filaments that run parallel to each other to form muscle fibers.
3. The myofibrils are made up of thick and thin myofilaments.
4. It helps to give the muscle its striated appearance.
5. The thin filaments contain three different proteins — actin, tropomyosin, and troponin.
6. Two actin filaments are wound together on which the tropomyosin is coiled around.
7. Troponin is present at certain points on tropomyosin, and it covers the binding site for myosin.

Final answer: The thin filament of a myofibril is a complex of three different proteins called actin, tropomyosin, and troponin.