Zoology - Locomotion and Movement Question with Solution | TestHub

Structure of Contractile Proteins:

A. Actin - Each actin (thin) filament consists of 2 'F' (filamentous) actins that are helically wound to each other. Each 'F' actin is a polymer of monomeric G' (Globular) actins.

B. Tropomyosin - Two filaments of tropomyosin also run close to the 'F' actins throughout its length.

C. Troponin - It is distributed at regular intervals on the tropomyosin. In a relaxed state, troponin masks the active binding sites on actin filaments (to prevent the binding of myosin).

D. Myosin - Each myosin (thick) filament is a polymerized protein with Meromyosin as monomeric proteins.