The knee-jerk reflex requires the activity of the

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Quizplus · Accepted Answer

The knee-jerk reflex is a simple reflex arc that only involves two neurons: a sensory neuron that detects the stretch of the muscle and a motor neuron that causes the muscle to contract. This reflex arc occurs entirely within the spinal cord and does not involve higher brain centers. Therefore, the knee-jerk reflex requires the activity of the spinal cord. The autonomic nervous system, sympathetic nervous system, and parasympathetic nervous system are not involved in this reflex.

The Knee-Jerk Reflex Requires the Activity of the