EMG studies have revealed that a voluntary movement of the arm, for example, when asked to pull a lever, is immediately preceded by
A) a brief cessation of breathing.
B) rapid eye movements.
C) recruitment of muscle fibers according to the "size principle."
D) a postural response.

Question

Quizplus · Accepted Answer

Voluntary movements are often preceded by postural adjustments to maintain balance and stability, which is why a postural response occurs before the actual movement.

EMG Studies Have Revealed That a Voluntary Movement of the Arm