Simple two neuron reflex arc involves

Options

A. Sensory neuron
B. Spinal cord
C. Effector neuron
D. All the above

Answer

D

Explanation

A motor neuron carries the message from the central nervous system to the effector. In a knee – jerk reflex arc the sensory neuron directly connects to the motor neuron in the spinal cord. This is called as simple reflex arc from the spindle (receptor) to where it connects with motor neuron in the spinal cord.