The thin filament of contractile muscle contains actin, myosin, and troponin, a complex of three proteins. Cardiac troponin T (cTnT) functions to bind the troponin complex to tropomyosin and has a molecular mass of 37 kDa. Cardiac troponin I (cTnI) functions to inhibit calcium-dependent ATPase and has a mass of 24 kDa.Click to see full answer. In respect to this, what are the components of a sarcomere?The Sarcomere: The Basic Contractile Unit of Muscle. A sarcomere is the basic contractile unit of muscle fiber. Each sarcomere is composed of two main protein filaments—actin and myosin—which are the active structures responsible for muscular contraction.Additionally, what is a thin filament composed of and what does it look like? Thin filaments, 7 nm in diameter, consist primarily of the protein actin, specifically fibrous (F) actin. Each F actin strand is composed of a string of subunits called globular (G) actin. Each G actin has an active site that can bind to the head of a myosin molecule. Also asked, what are thin filaments made of? The myofibrils are made up of thick and thin myofilaments, which help give the muscle its striped appearance. The thick filaments are composed of myosin, and the thin filaments are predominantly actin, along with two other muscle proteins, tropomyosin and troponin.What is the role of the sarcomere in muscle contraction?Sarcomeres are able to initiate large, sweeping movement by contracting in unison. Their unique structure allows these tiny units to coordinate our muscles’ contractions. The image depicts skeletal muscle fiber. In fact, the contractile properties of muscle are a defining characteristic of animals.