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The functional unit is the dendrite, which relays electrical signals throughout the nervous system.

The functional unit is the soma, which transmits electrical signals from sense organs, muscles, and glands.

The functional unit is the neuron, which transmits electrical and chemical signals from sense organs, muscles, and glands.

The functional unit is the neuron, which filters signals from the body, catalyzes action potentials, and insulates them from the surrounding environment.