Which term refers to the part of the nervous system consisting of the brain and spinal cord?

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

Answer: (D)

The central nervous system is the part of the nervous system that includes the brain and spinal cord and acts as the body's processing and control center. It receives information from the peripheral nerves, processes it, and then coordinates responses by sending signals back out to muscles and glands. The brain handles complex processing, such as thinking and sensing, while the spinal cord not only transmits messages between the brain and the body but also handles many quick reflex actions on its own. The other parts of the nervous system lie outside this central hub: the peripheral nervous system includes all nerves outside the brain and spinal cord, the autonomic nervous system controls involuntary functions like heart rate and digestion as part of the peripheral system, and the enteric nervous system is a network within the gut that can manage some digestive functions independently but still relates to the rest of the system.