MUSCLE PHYSIOLOGY

Detailed explanation-1: -G-actin polymerizes noncovalently into actin filaments, called F-actin. Actin filaments consist of two strands of globular molecules twisted into a helix with a repeat distance of about 36 nm.

Detailed explanation-2: -An actin protein is the monomeric subunit of two types of filaments in cells: microfilaments, one of the three major components of the cytoskeleton, and thin filaments, part of the contractile apparatus in muscle cells.

Detailed explanation-3: -Actin (molecular mass of 42 kDa) is the major component of thin filaments. Actin filaments consist of two strands of globular molecules twisted in the form of a helix (see Fig.