MICROANATOMY

Detailed explanation-1: -Sarcomeres consist of highly ordered arrays of thick myosin and thin actin filaments along with accessory proteins.

Detailed explanation-2: -Myosin forms filaments in an antiparallel fashion at the center of the thick filament, while myosin forms filaments in a parallel way in the rest of the thick filament. Consequently, a bipolar thick filament is formed, leaving a central bare zone in the middle.

Detailed explanation-3: -Introduction. Myosin filaments (also called thick filaments) are key components of muscle and non-muscle cells.

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.

Detailed explanation-5: -This is called the sarcomere (Figure 1d) and it represents the main functional repeating unit of the myofibril. The sarcomere is approximately 2–3 m in length, and consists of overlapping parallel arrays of actin [thin] filaments and myosin [thick] filaments.