Final answer:
The nervous system is a complex network that carries electrical messages throughout the body and controls all other body systems. It allows us to think, learn, sense our surroundings, and control our internal body systems.
Step-by-step explanation:
The nervous system is a complex network of nervous tissue that carries electrical messages throughout the body. It includes the brain, spinal cord, and peripheral nerves.
The nervous system allows us to think, learn, sense our surroundings, and control our internal body systems. It coordinates our behavior by transmitting electrical signals to and from different parts of the body.