User:Hardwigg/sandbox

Sarcomere edits
A sarcomere (Greek sarx "flesh", meros "part") is the basic contractile unit of muscle fibers in striated muscle tissue. These units contain long, fibrous proteins that slide past each other resulting in muscle contraction or relaxation. In skeletal and cardiac muscles, repeating sections of sarcomeres form myofibrils, and appear as a series of dark and light bands under a microscope.