Your nervous system is a complex communication network in which signals are constantly being received, integrated, and transmitted. When the stimulation from another neuron is sufficient, the battery sends an action potential down the neuron.
Thick neurons conduct action potentials faster.
Impulses travel even faster if neuron has myelin insulation. Moritmer Turnipseed has the largest neuron twine-ball in the midwest. The neurons aren't physically connected to each other so the nerve impulse has to be converted to a chemical which ferries across the gap between the neurons. Chemicals as Couriers Chemicals called neurotransmitters are the signal couriers that jump across the synaptic cleft Presynaptic neuron sends the signal. Postsynaptic neuron receives the signal.