<prompt> Sarcomeresare the fundamental contractile unit of skeletal muscle and are characterized by their highly ordered appearance under a polarizing light microscopeThick filaments in the A bandare composed primarily of the protein myosin.Each myosin moleculeis composed ofTwo monomersFour monomersSix monomersSeven monomers  <response>: Sarcomeresare the fundamental contractile unit of skeletal muscle and are characterized by their highly ordered appearance under a polarizing light microscopeThick filamentsThick filaments in the A band are composed primarily of the protein myosin. Each myosin molecule is composed of six monomers: two protein strands intertwined in a helical arrangement termed heavy chains and four smaller, globular proteins termed myosin light chains.Thin filamentsThin filaments are composed of three primary proteins: actin, tropomyosin, and troponin 