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Definition of Knee jerk

Knee jerk: The reflex that is tested by tapping just below the bent knee on the patellar tendon. Normally this causes the quadriceps muscle to contract and bring the lower leg forward. It has given rise to the saying 'a knee-jerk reaction.' Also known as patellar reflex.

QUESTION

The abbreviated term ADHD denotes the condition commonly known as: See Answer
Reviewed on 12/12/2018
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