Which pair does not fit?

Which pair does not fit?

• A. Association neurons - interneurons
• B. Multipolar neurons - motor neurons
• C. Sensory neurons - afferent neurons
• D. Sensory neurons - efferent neurons

Answer: (D)

Think about the direction of information flow and how neurons are categorized. Sensory neurons carry information toward the central nervous system and are known as afferent neurons. Efferent neurons, on the other hand, carry commands away from the CNS to muscles or glands (they’re motor neurons). Pairing a sensory neuron with an efferent neuron mixes two opposite roles, so that combination doesn’t fit. The other pairs line up more clearly: association neurons are interneurons, multipolar neurons are commonly motor neurons, and sensory neurons are afferent.

Think about the direction of information flow and how neurons are categorized. Sensory neurons carry information toward the central nervous system and are known as afferent neurons. Efferent neurons, on the other hand, carry commands away from the CNS to muscles or glands (they’re motor neurons). Pairing a sensory neuron with an efferent neuron mixes two opposite roles, so that combination doesn’t fit. The other pairs line up more clearly: association neurons are interneurons, multipolar neurons are commonly motor neurons, and sensory neurons are afferent.