Central Nervous System (CNS): This includes both the brain and spinal cord. It's like government headquarters overseeing all transportation systems in our analogy.
Peripheral Nervous System (PNS): This consists of all nerves outside CNS; it sends information back and forth from CNS to rest of body - think local roads connecting with our main highway (spinal cord).
Reflex Arcs: These are automatic responses coordinated within spinal cord without input from brain - similar to automated toll booths on highways that allow traffic flow without manual intervention.