Tapping the patellar tendon with a reflex hammer produces a brief contraction of the knee extensors. What is the cause of the muscle contraction?
Correct Answer: Muscle spindle activation
Description: Ans. C. Muscle spindle activationMuscle spindles monitor muscle length. If the muscle is suddenly stretched, the spindle produces action potentials that activate homonymous motor neurons to contract the stretched muscle and resist the length change.
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