Reflex give somebody the third degree?
Answers: A stretch reflex is a muscle contraction as a result of stretching of that muscle. It is a way of maintain muscle length within comfortable boundaries. Wikipedia have a more complete explanation of this phenomenon.
Slight taps on undisputed nerves cause the associated muscle to involuntarily contract, creating a 'yank.'
The best known is to cross you legs within a sitting position and tap only just below the kneecap on the upper leg. It triggers the shin muscles and you kick out.
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