Neuron is the unit of

It contains densely packed nerve cells called neurons, which are specialised for conduction of nerve impulses. Each nerve cell is called a neuron. These are highly specialised cells. They have the ability to receive stimulus from within or outside and send impulses to different parts of the body. Each cell consists of three parts, the cyton or the cell body, the dendrons which are short processes arising from the cyton and further branch into thin dendrites, and the axon which is a single long cylindrical process forming fine branches terminally. Dendrites receive impulses and the axon takes impulses away from the cell body.