What are the two main divisions of the nervous system, and what do they encompass?

What are the two main divisions of the nervous system, and what do they encompass?

• A. Central and Peripheral nervous systems.
• B. Autonomic and Somatic nervous systems.
• C. Cerebral and Spinal systems.
• D. Nervous and Endocrine systems.

Answer: (A)

The main idea here is that the nervous system is organized into a central part and a peripheral part. The central nervous system includes the brain and spinal cord, where information is processed and integrated. The peripheral nervous system includes all the nerves and ganglia outside the CNS, carrying sensory information to the brain and spinal cord and sending motor commands out to the body. Within the peripheral system there are functional subdivisions like the autonomic (involuntary control of organs) and somatic (voluntary control of skeletal muscles and conscious sensing), but these are parts of the peripheral system, not the two broad divisions themselves. Other options mix up components (brain and spinal cord are both CNS elements) or compare the nervous system to the endocrine system, which is a different system entirely.

The main idea here is that the nervous system is organized into a central part and a peripheral part. The central nervous system includes the brain and spinal cord, where information is processed and integrated. The peripheral nervous system includes all the nerves and ganglia outside the CNS, carrying sensory information to the brain and spinal cord and sending motor commands out to the body. Within the peripheral system there are functional subdivisions like the autonomic (involuntary control of organs) and somatic (voluntary control of skeletal muscles and conscious sensing), but these are parts of the peripheral system, not the two broad divisions themselves. Other options mix up components (brain and spinal cord are both CNS elements) or compare the nervous system to the endocrine system, which is a different system entirely.