A Reflex Arc

Question

A reflex arc
A)has only sensory and interneurons.
B)is composed of three interneurons.
C)has a sensory neuron, an interneuron, and a motor neuron.
D)has an interneuron between two motor neurons.

Accepted Answer

A reflex arc consists of a sensory neuron that receives a stimulus and sends a signal to an interneuron in the spinal cord or brainstem, which then sends a signal to a motor neuron that directs a response from a muscle or gland. Therefore, a reflex arc typically includes a sensory neuron, an interneuron, and a motor neuron.