Answer
The thin (actin) filaments will slide pas the thick (myosin) filaments to the center. As it does so, the Z lines will relocate, and the H band will get smaller until it completely disappears.
Work Step by Step
The thin (actin) filaments will slide pas the thick (myosin) filaments to the center. As it does so, the Z lines will relocate, and the H band will get smaller until it completely disappears.