Physiology Muscle Physiology 74b512ef In muscle contraction all are true except A A bond remains unchanged B H zone disappears C I band becomes wider D Two Z line come closer High-Yield Explanation Ans. (c) I band becomes wider(Ref: Ganong, 25th ed/p.100)When muscle contracts,#Z lines come closer#Length of H and I band decrease#Length of A band remains constant