The knee-jerk reflex requires the activity of the
A) central nervous system.
B) autonomic nervous system.
C) sympathetic nervous system.
D) parasympathetic nervous system.

Question

Quizplus · Accepted Answer

The knee-jerk reflex is a simple reflex that involves only a sensory neuron and a motor neuron, without the involvement of the autonomic or voluntary motor pathways. The sensory neuron enters the spinal cord and synapses directly onto the motor neuron, which exits the spinal cord and causes the contraction of the quadriceps muscle, resulting in the knee-jerk response. Therefore, the activity of the central nervous system is required for the knee-jerk reflex.

The Knee-Jerk Reflex Requires the Activity of the