In the human knee-jerk reflex, as the calf is raised from the vertical toward the horizontal, the muscles of the quadriceps (flexors on the ventral side of the thighs)and the muscles of the hamstring (extensors on the dorsal side of the thighs)are

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In the knee-jerk reflex, the quadriceps are excited to contract and extend the leg, while the hamstrings are inhibited to allow this movement.

In the Human Knee-Jerk Reflex, as the Calf Is Raised