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Knee-jerk Reaction
 

You probably know that if one were to lightly strike a bent knee in a certain place, the leg will jerk, trying to straighten out. This reflex movement (absolute reflex) arises in the following fashion. The spinal chord is informed of a mechanical impact via a sensory neuron. At the synapse (the locus where two neurons meet) this impulse is transferred to a neuron that is responsible for body movement (motor neuron). This neuron makes the muscle contract and the leg to come straight.

Press "Run" button to initiate the animation. Press "Stop" to bring it to a halt, and press "Reset" to return the model to its initial state.

 
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