Thick and Thin Filaments

Two important fliaments of Muscle system of human body : thick and thin filaments
Thin Filaments : twisted actin molecules and each has an active site where they interact with myosin. In resting phase – active site covered by tropomyosin which is held in place by troponin

Thick filaments: Myosin filaments and they are head attaches to actin during contraction
Can only happen if troponin changes position, moving tropomyosin to expose active site.