Which statement best describes the nervous system?

Which statement best describes the nervous system?

• A. Consists of the central nervous system (brain and spinal cord) and the peripheral nervous system.
• B. Is primarily responsible for movement and support of the body.
• C. Includes the lymph nodes and immune cells.
• D. Regulates digestion exclusively.

Answer: (A)

The nervous system is a network that includes the brain and spinal cord (the central nervous system) and all the nerves outside the CNS (the peripheral nervous system). This structure lets the body sense its environment, process information, and coordinate actions by transmitting signals between the brain and every part of the body. The central nervous system acts as the control center, while the peripheral nervous system links it to muscles, organs, and sense organs. Other options don’t fit because movement and support come mainly from the musculoskeletal system, not the nervous system. Lymph nodes and immune cells belong to the immune system. While the nervous system does regulate digestion via autonomic pathways, it does not regulate it exclusively—digestion also involves other organs and hormonal controls.

The nervous system is a network that includes the brain and spinal cord (the central nervous system) and all the nerves outside the CNS (the peripheral nervous system). This structure lets the body sense its environment, process information, and coordinate actions by transmitting signals between the brain and every part of the body. The central nervous system acts as the control center, while the peripheral nervous system links it to muscles, organs, and sense organs.

Other options don’t fit because movement and support come mainly from the musculoskeletal system, not the nervous system. Lymph nodes and immune cells belong to the immune system. While the nervous system does regulate digestion via autonomic pathways, it does not regulate it exclusively—digestion also involves other organs and hormonal controls.