Step 1: Understanding the Concept:
Every organ system has a fundamental structural and functional unit that carries out its specialized task. For the nervous system, the task is the transmission of electrical impulses.
Step 2: Detailed Explanation:
1. Neuron (Nerve Cell): It is the basic unit of the nervous system. It is specialized to receive, process, and transmit information through electrical and chemical signals.
2. Nephron: The functional unit of the kidney (filtration).
3. Osteon: The structural unit of compact bone.
4. Sarcomere: The fundamental unit of muscle contraction.
Step 3: Final Answer:
The neuron is the specialized cell that forms the communication network of the nervous tissue.