Jia Li accidentally touched a hot curling iron on her dresser and quickly jerked back her hand. Which neuron is responsible for carrying the message from Jia Li's spinal cord to the muscles in her arm, causing her hand to yank away from the hot curling iron?

• A. Sensory neuron
• B. Motor neuron
• C. Interneuron
• D. Reflex neuron

Answer: (B)

Verified step by step guidance

1. Understand the basic function of different types of neurons: Sensory neurons carry signals from sensory receptors to the central nervous system, motor neurons carry signals from the central nervous system to muscles, and interneurons connect neurons within the central nervous system.
2. Identify the process involved in a reflex action: A reflex action is an automatic and rapid response to a stimulus, which involves sensory neurons, interneurons, and motor neurons.
3. Recognize the role of sensory neurons in this scenario: Sensory neurons detect the stimulus (the hot curling iron) and send a signal to the spinal cord.
4. Understand the role of interneurons: Interneurons in the spinal cord process the information and form a connection between sensory and motor neurons.
5. Identify the role of motor neurons: Motor neurons carry the message from the spinal cord to the muscles in Jia Li's arm, causing her to jerk her hand away from the hot curling iron.