what are the different regions of the sarcomere
Myofibrils are constructed and lined up in a chain-like formation to create what are called sarcomeres. Sarcomeres contain several regions. One region is called the A-bands and only consist of myosin filaments. The counterpart of A-bands is the I-bands that only contain actin filaments.The ends of each sarcomere are called Z discs.A middle region of each sarcomere called the H-zone only contains myosin. According to the sliding filament theory by Andrew Huxley and Ralph Niedergerke, muscles contract when Z-discs come closer together thus shortening the sarcomeres.s this overlap occurs, myosin filaments are binding to the actin filaments, allowing myosin to function as the driving motor of filament sliding. This relative movement between myosin and actin is what results in muscle contraction.