The knee-jerk reflex uses one more neuron than does the withdrawal reflex.

Name: The knee-jerk reflex uses one more neuron than does the withdrawal reflex.
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The knee-jerk reflex is a monosynaptic reflex that involves only two neurons (a sensory neuron and a motor neuron), whereas the withdrawal reflex is a polysynaptic reflex that involves at least three neurons (a sensory neuron, an interneuron, and a motor neuron), making the withdrawal reflex more complex.

The Knee-Jerk Reflex Uses One More Neuron Than Does the Withdrawal