1. Structural and Functional Unit of Nervous System:
The structural and functional unit of the nervous system is the Neuron.
2. Explanation:
A neuron is responsible for transmitting electrical signals in the nervous system. It consists of three main parts: the cell body, dendrites, and axon, which help in the reception and transmission of signals.
Final Answer:
The structural and functional unit of the nervous system is $ {\text{Neuron}} $.