What does the term "power stroke" refer to?
A)The transmission of a signal from the motor neuron to the muscle fiber
B)The movement of the myosin head toward the center of the sarcomere
C)The shortening of the sarcomere
D)The cleaving of ATP into ADP and a phosphate

Question

Quizplus · Accepted Answer

The power stroke refers to the movement of the myosin head toward the center of the sarcomere during muscle contraction, as it pulls the actin filament towards the center as well. This movement is powered by the energy released from the cleavage of ATP into ADP and a phosphate. The transmission of a signal from the motor neuron to the muscle fiber is known as neuromuscular junction, and the shortening of the sarcomere is the overall result of multiple power strokes.

What Does the Term "Power Stroke" Refer To