Which structure comprises the central nervous system?

• A. Central nervous system
• B. Peripheral nervous system
• C. Autonomic nervous system
• D. Somatic nervous system

Answer: (A)

The central nervous system is the command center of the body, and it is made up of the brain and spinal cord. The brain processes sensory information, thoughts, memories, and coordinates responses, while the spinal cord transmits signals between the brain and the rest of the body and can coordinate many reflexes on its own. The other parts mentioned belong to the peripheral nervous system, which includes nerves that reach out to limbs and organs. Within that peripheral network, the autonomic nervous system handles involuntary functions like heart rate and digestion, and the somatic nervous system governs voluntary movement and conscious sensation. So, brain and spinal cord are the structures that comprise the central nervous system.