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.

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A Reflex Arc

Question 19

Multiple Choice

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.

Correct Answer: