MICROANATOMY

Detailed explanation-1: -ATP prepares myosin for binding with actin by moving it to a higher-energy state and a “cocked” position. Once the myosin forms a cross-bridge with actin, the Pi disassociates and the myosin undergoes the power stroke, reaching a lower energy state when the sarcomere shortens.

Detailed explanation-2: -Abstract. Motile forces in muscle are generated by the so-called “power stroke, ‘’ a series of structural changes in the actomyosin cross-bridge driven by hydrolysis of ATP.

Detailed explanation-3: -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-4: -Muscle contraction occurs when sarcomeres shorten, as thick and thin filaments slide past each other, which is called the sliding filament model of muscle contraction. ATP provides the energy for cross-bridge formation and filament sliding.