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Reflex Patella Knee Jerk Knee Cap Tapped Tendons Stretch Acting

Front knee-jerk reflex
Back once patella (below knee-cap) tapped, the patella tendons stretch, acting as stimuli for reflex arc resulting in extensor muscles in upper thigh to contract, at same time, relay neurones inhibit motor neurone to flexor muscle (relaxes), coordination of contraction and relaxation causes leg to kick out

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