Which event occurs immediately before the power stroke that moves actin and myosin filaments past one another?
A) Calcium is released from the sarcoplasmic reticulum.
B) ATP binds to myosin.
C) Myosin heads bind to actin.
D) Calcium binds to troponin.
E) Myosin releases phosphate ion.

Question

Quizplus · Accepted Answer

The release of the phosphate ion from the myosin head occurs immediately before the power stroke, which allows the myosin head to pivot and pull the actin filament, resulting in muscle contraction.

Which Event Occurs Immediately Before the Power Stroke That Moves