Which of the following is true about motor neurons?

• A. They can only control the actions of muscles.
• B. They transmit signals to responsive tissues.
• C. They tell the brain what the muscles are doing.
• D. They send signals from sensory neurons to the brain.

Answer: (B)

Motor neurons are the efferent nerves that carry commands from the brain and spinal cord to the body’s effectors. They transmit signals to responsive tissues, especially muscles, to produce movements and to glands to influence secretion. The other statements mix up the flow of information or targets: motor neurons do not report back to the brain about muscle status—that feedback comes from sensory pathways—and they do not originate signals from sensory neurons. They mainly convey instructions to tissues that respond.