What is the primary role of interneurons in neural communication?

• A. They connect sensory and motor neurons
• B. They transmit signals to the brain
• C. They form the blood-brain barrier
• D. They generate action potentials

Answer: (A)

Interneurons act as communication hubs inside the central nervous system, linking different neurons to process information. In many circuits, they bridge sensory input with motor output, receiving signals from sensory neurons or other interneurons and passing messages to motor neurons that control muscles. This wiring enables reflexes and more complex processing, as signals are integrated and modulated before a response is produced. While interneurons can influence how strongly a signal is transmitted (they can be inhibitory or excitatory), their defining role is the connections they form within the CNS—not simply transmitting to the brain, forming the blood-brain barrier, or generating action potentials by themselves.