Sarcomeres in myofibrils of relaxed skeletal muscle

Colour-enhanced transmission electron micrograph of myofibrils in an uncontracted skeletal muscle cell (muscle fibre) showing the structure of the sarcomere with its dark and light bands between the two Z-discs. One of the cell's many nuclei can also be seen. The distance between the two Z-discs is 2.45 micrometres.