Difference between Troponin and Tropomyosin

 Out of the three, cardiac and skeletal muscles are composed of thin and thick filaments called sarcomere that enable muscle contraction. 

Troponin and tropomyosin are two proteins that are present on the thin filaments of the muscle cells and help in the contraction of muscles.

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Is tropomyosin a thick filament?

The thick filaments are made up of myosin while the thin filament is made up of three proteins actin, troponin, and tropomyosin.Jan 9, 2020

The thick filaments of muscle consist of several hundred myosin molecules, associated in a parallel staggered array by interactions between their tails (Figure 11.23).

 The globular heads of myosin bind actin, forming cross-bridges between the thick and thin filaments.