Which structures make up the Central Nervous System?

• A. Brain and Spinal Cord
• B. Nerves Outside CNS
• C. Hormones
• D. Muscles

Answer: (A)

The main idea is how the nervous system is organized into the central nervous system versus the peripheral nervous system. The central nervous system is made up of the brain and spinal cord, which act as the command center for the body. The brain processes sensory information, stores memories, and directs actions, while the spinal cord carries signals between the brain and the rest of the body and handles many reflexes. The other options refer to parts outside the CNS or different body systems: nerves outside the CNS are part of the peripheral nervous system; hormones belong to the endocrine system; and muscles are the tissues that move the body, controlled by the nervous system but not part of the CNS itself.