Which statement correctly differentiates the peripheral nervous system from the central nervous system?

Which statement correctly differentiates the peripheral nervous system from the central nervous system?

• A. The Peripheral Nervous System transmits information to and from the CNS and is located outside the CNS; The Central Nervous System comprises the brain and spinal cord.
• B. The Peripheral Nervous System regulates hormones; The Central Nervous System controls reflexes only.
• C. The Peripheral Nervous System is inside the brain; The Central Nervous System is outside the brain.
• D. The Peripheral Nervous System stores memories; The Central Nervous System processes emotions only.

Answer: (A)

The key idea is understanding where each part of the nervous system is and what it does in terms of information flow. The central nervous system is made up of the brain and spinal cord. The peripheral nervous system includes all the nerves outside the brain and spinal cord and serves as the communication network that carries information to the brain and spinal cord and then carries responses back out to the body. This arrangement explains why sensory signals from the skin and organs travel through peripheral nerves to the CNS for processing, and why motor commands travel from the CNS back through peripheral nerves to muscles and glands. That’s why the statement describing the PNS as transmitting information to and from the CNS and being located outside the CNS is the best fit. Other options mix up locations or functions—for example, suggesting the PNS is inside the brain, claiming it regulates hormones, or implying it stores memories—none of which accurately reflect the distinct roles and placements of the CNS and PNS.

The key idea is understanding where each part of the nervous system is and what it does in terms of information flow. The central nervous system is made up of the brain and spinal cord. The peripheral nervous system includes all the nerves outside the brain and spinal cord and serves as the communication network that carries information to the brain and spinal cord and then carries responses back out to the body. This arrangement explains why sensory signals from the skin and organs travel through peripheral nerves to the CNS for processing, and why motor commands travel from the CNS back through peripheral nerves to muscles and glands.

That’s why the statement describing the PNS as transmitting information to and from the CNS and being located outside the CNS is the best fit. Other options mix up locations or functions—for example, suggesting the PNS is inside the brain, claiming it regulates hormones, or implying it stores memories—none of which accurately reflect the distinct roles and placements of the CNS and PNS.