GENERAL HISTOLOGY

Detailed explanation-1: -Actin is the thin filaments of the muscles. They are a polymer of G-actin monomers arranged in chains and two such chains are wound in a helix. So, the given statement is true.

Detailed explanation-2: -An individual sarcomere contains many parallel actin (thin) and myosin (thick) filaments. The interaction of myosin and actin proteins is at the core of our current understanding of sarcomere shortening.

Detailed explanation-3: -Actin. The thin filament consists of two intertwined bands of actin monomers. Both skeletal and cardiac forms of actin are present during human cardiac development.