MICROANATOMY

Detailed explanation-1: -Sarcomeres consist of highly ordered arrays of thick myosin and thin actin filaments along with accessory proteins. Thick filaments occupy the center of sarcomeres where they partially overlap with thin filaments.

Detailed explanation-2: -The enzyme at the binding site on myosin is called ATPase. The energy released during ATP hydrolysis changes the angle of the myosin head into a “cocked” position.

Detailed explanation-3: -Myosin forms thick filaments (15 nm in diameter) and actin forms thinner filaments (7nm in diameter). Actin and myosin filaments work together to generate force. This force produces the muscle cell contractions that facilitate the movement of the muscles and, therefore, of body structures.

Detailed explanation-4: -The thick filament, myosin, has a double-headed structure, with the heads positioned at opposite ends of the molecule. During muscle contraction, the heads of the myosin filaments attach to oppositely oriented thin filaments, actin, and pull them past one another.