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Nervous System

The nervous system has three levels of organization:

NeuronAt the most simple level is the neuron. A neuron is a large, complex cell designed to propagate and transmit chemical and electrical signals to other cells such as muscle fibers or fellow neurons.
Local CircuitWithin local circuits, interconnected nerve cells elaborate incoming signals and send the output to other centers or circuits.
SystemAt a higher level, connections among systems (aka pathways) make possible complex behaviors such as reading and speaking.