What is the significance of the 'A' band during muscle contraction?
1
It shortens during muscle contraction as the actin filaments slide past the myosin filaments.
2
It remains unchanged in length during contraction as the thick and thin filaments overlap.
3
It is where the Z-lines are attached to the actin filaments.
4
It is the area where only thin (actin) filaments are found.