What is the basic unit of the Nervous System? Neuron, a cell specialized for transmitting information within the human body, is the basic unit of the nervous system. 2. What is the role of Nervous system in behavior? The nervous system involves the brain that is responsible for information processing and then acting upon it. All the overt behavior comes through very carefully crafted biological processes in the nervous system. 3. How the Nervous System is organized? The Nervous system is divided into the central and peripheral systems. The CNS comprises of brain and spinal cord. The PNS is the network of nerves outside the brain and spinal cord. PNS is further divided into somatic and autonomic nervous system.