The Sliding Mechanism of Myofilaments Works When ________

The sliding mechanism of myofilaments works when ________.

A) the thick filaments detach from the muscle tendon
B) the myosin heads of the thick filaments bind to active sites on the actin molecules of the thin filaments
C) the myosin heads pivot away from the M line toward the Z lines
D) the troponin-tropomyosin complex interacts with the actin molecules
E) calcium ions bind to active sites on the actin molecules of the thin filaments