When brian touches a hot object, which are at work to him react appropriately to protect himself? a. sensory neurons, brain, and motor neurons b. sensory neurons, myelin sheath, and brain c. sensory neurons, interneurons, and motor neurons d. myelin sheath, interneurons, and motor neurons

The correct answer would be c. sensory neurons, interneurons, and motor neurons.

A is a tempting answer, however, it is wrong as with something as urgent as touching a hot object, you need to react quickly so you wont want to waste time going all the way up to the brain to move your hand out of the way. Instead, using interneurons, the signal instead travels to the spinal cord and then straight back to move your hand, which is known as a reflex arc.

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