A Correct Description of the Movements of Actin and Myosin

Multiple Choice

A correct description of the movements of actin and myosin fibers is:

A) Binding with ATP shortens the muscle fiber;reverse binding elongates the fiber.
B) The energy from breaking down ATP to ADP + P is used to convert actin into myosin.
C) The calcium ions are used as energy to split ATP to shorten the fiber.
D) When ADP and P come off myosin,the crossbridges move the actin filaments to shorten the muscle fiber.
E) Actin filament heads break down ATP and then attach to a myosin filament to form cross-bridges.