In the Human Knee-Jerk Reflex of a Seated Individual, as the Calf

Multiple Choice

In the human knee-jerk reflex of a seated individual, as the calf is raised from a vertical position to a horizontal position, the muscles of the quadriceps (on the front of the thighs) and the muscles of the hamstring (on the back side of the thighs) are ________.

A) both excited and contracting
B) both inhibited and relaxed
C) excited and inhibited, respectively
D) inhibited and excited, respectively