Sometimes, When It Is Difficult to Initiate a Knee-Jerk Reflex

question 65

Essay

Sometimes, when it is difficult to initiate a knee-jerk reflex by tapping the patellar tendon, a patientwill be asked to voluntarily make a fist. Then the reflex will be easily evoked. What does this illustrate about the relation between voluntary and involuntary reflex movement?

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