MUSCLE PHYSIOLOGY

Detailed explanation-1: -Actin filaments, usually in association with myosin, are responsible for many types of cell movements. Myosin is the prototype of a molecular motor-a protein that converts chemical energy in the form of ATP to mechanical energy, thus generating force and movement.

Detailed explanation-2: -Thin Filaments The main component is the actin filament, which is formed from the polymerization of globular actin molecules. Each globular actin monomer contains a binding site for the globular myosin head. Along the entire length of the thin filament, actin monomers spiral around a structural protein called nebulin.

Detailed explanation-3: -The major cytoskeletal protein of most cells is actin, which polymerizes to form actin filaments-thin, flexible fibers approximately 7 nm in diameter and up to several micrometers in length (Figure 11.1).