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What is knee jerk reflex?...

What is knee jerk reflex?

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Knee jerk is a sudden movement of leg by striking the patellar ligament.
It is a reflex where the brain does not involve.
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VGS PUBLICATION-BRILLIANT-COORDINATION - THE LINKING SYSTEM-ACTIVITIES
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  16. What did they do in their experiment?

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  17. What did they observe by that experiment?

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