If someone steps on a sharp object with their right foot, it will lead to Multiple Choice a monosynaptic reflex causing contraction of the right hamstring and a polysynaptic reflex causing contraction of the left hamstring. polysynaptic reflexes involving contraction of the right hamstring and left quadriceps. polysynaptic reflexes involving contraction of the right quadriceps and left hamstrings. a monosynaptic reflex causing contraction of the right quadriceps and a polysynaptic reflex causing contraction of the the left hamstring.