The reason the lower leg extends when the knee is tapped is because of the lock and key mechanism.

Name: The reason the lower leg extends when the knee is tapped is because of the lock and key mechanism.
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Quizplus · Accepted Answer

Lock and key mechanism: As the knee is tapped,impulses are sent to and from the brain.The neurotransmitters affect specific receptors that are interpreted.The reaction sent via neurotransmitters is to extend the lower leg.

The Reason the Lower Leg Extends When the Knee Is