knee-jerk reflex


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Noun1.knee-jerk reflex - a reflex extension of the leg resulting from a sharp tap on the patellar tendon
References in periodicals archive ?
By connecting the "branches" of their dendrites to the "root tips" of other neurons' axons, nerve cells form networks, which can be as simple as the few connections involved in the knee-jerk reflex or as complex as those in the human brain.
3] as a knee-jerk reflex despite the currently very low risk of occult bacteremia in low-risk children.
In a short-sighted but knee-jerk reflex response, the U.