I know that when ADP binds to the myosin head, it moves along and as it does so, it releases the ADP. The ATP attaches to the myosin head and releases the myosin head from the actin filament. Then the enzyme ATPase hydrolises the ATP to ADP, causing the myosin head to move to the original position.
My question is:
- How does the actin filament (troponin) move to its original position? Does it use a mechanism similar to a spring?
- Is there a limit to how much the myosin head can pull the actin filament?